scholarly journals Growth performance of Dipterocarpus alatus and Hopea odorata in degraded secondary forest land in Southern Vietnam

Dendrobiology ◽  
2020 ◽  
Vol 83 ◽  
pp. 60-67
Author(s):  
Nguyen Thanh Tuan ◽  
Tai Tien Dinh
Keyword(s):  
Growth Performance ◽  
Secondary Forest ◽  
Forest Land ◽  
Southern Vietnam ◽  
Dipterocarpus Alatus ◽  
Hopea Odorata

MANAJEMEN DATA SPASIAL: PENGGUNAAN TANAH WILAYAH PEDESAAN DI SUMATERA BARAT

2019 ◽  
Vol 5 (2) ◽  
pp. 48-53
Author(s):  
Afrital Rezki, S.Pd., M.Si ◽  
Erna Juita ◽  
Dasrizal Dasrizal ◽  
Arie Zella Putra Ulni
Keyword(s):  
Land Use ◽  
Paddy Field ◽  
Secondary Forest ◽  
Water Bodies ◽  
Primary Forest ◽  
Land Uses ◽  
Forest Land ◽  
Land Use Patterns ◽  
Crop Fields ◽  
Mixed Plantations

Perkembangan penggunaan tanah bergerak horisontal secara spasial ke arah wilayah yang mudah diusahakan. Penggunaan tanah juga bergerak secara vertikal dalam rangka menaikkan mutunya. Penelitian ini bertujuan untuk menganalisis pola penggunaan lahan, bagaimana manajemen penggunaan lahan di satu wilayah berdasarkan batas Nagari. Metode yang digunakan adalah analsisis spasial dengan interpretasi citra penginderaan jauh, survey lapangan, dan analisis deskriptif. Pertumbuhan pemukiman Nagari Sungai Sariak Kecamatan VII Koto Kabupaten Padang Pariaman mengakibatkan pemanfaatan ruang menjadi tumpang tindih. Diperlukan cara-cara pengelolaan dan managemen penggunaan tanah dalam rangka pembangunan berkelanjutan yang menaikkan taraf hidup masyarakat dan tidak menimbulkan kerugian lingkungan.Terdapat 9 jenis penggunaan lahan yang ada di Nagari Sungai Sariak. Penggunaan lahan tersebut adalah Primary Forest, Secondary Forest, Paddy Field, Settlement, Mixed Plantations, Crop Fields, Water Bodies, Bushes, dan Plantations. Penggunaan lahan yang paling luas di Nagari Sungai Sariak adalah jenis penggunaan lahan Primary Forest, sebesar 48% dari total luas wilayah Nagari Sungai Sariak. Pada tahun 2011 sampai tahun 2016, penggunaan lahan paling luas terjadi pada penggunaan lahan jenis Primary Forest yang kemudian menjadi Mixed Plantations. Land use Changes moved horizontally spatially towards areas that are easily cultivated. The land use also moves vertically in order to increase its quality. This study aims to analyze land use patterns, how land use management in one area is based on Nagari boundaries. The method used is spatial analysis with interpretation of remote sensing images, field surveys, and descriptive analysis. The growth of Nagari Sungai Sariak in Kecamatan VII Koto, Kabupaten Padang Pariaman resulted in overlapping use of space. Management methods are needed and management of land use in the framework of sustainable development that raises the standard of living of the community and does not cause environmental losses. There are 9 types of land use in the Nagari Sungai Sariak. The land uses are Primary Forest, Secondary Forest, Paddy Field, Settlement, Mixed Plantations, Crop Fields, Water Bodies, Bushes, and Plantations. The most extensive land use in Nagari Sungai Sariak is the type of Primary Forest land use, amounting to 48% of the total area of the Nagari Sungai Sariak. From 2011 to 2016, the most extensive land use occurred in Primary Forest land uses which later became Mixed Plantations.

Growth Performance of 9-Years-Old selected 5 Indigenous Wood Species Planted on Degraded Forest Land

2007 ◽  
Vol 2 (3) ◽  
pp. 302-306 ◽  
Author(s):  
Affendy Hassan ◽  
Razak Wahab ◽  
Mohamad Azani Alias ◽  
Rafidah Md. Salim
Keyword(s):  
Growth Performance ◽  
Wood Species ◽  
Degraded Forest ◽  
Forest Land

scholarly journals ANALISIS INFILTRASI BERBAGAI UNIT LAHAN YANG BERBEDA PADA SUB DAS BANYU IRANG DAS MALUKA

2021 ◽  
Vol 1 (1) ◽  
pp. 47-58
Author(s):  
Friska Aprilia Banjarina ◽  
Badaruddin Badaruddin ◽  
Syarifuddin Kadir
Keyword(s):  
Land Cover ◽  
Secondary Forest ◽  
Infiltration Rate ◽  
Soil Bulk Density ◽  
Forest Land ◽  
Infiltration Capacity ◽  
Factors Affecting ◽  
A Value ◽  
Different Types ◽  
Forest Land Cover

The purpose of this study is to analyze the infiltration rate in land units with different types of land cover in the Banyu Irang Sub Watershed in the Maluka Watershed. Analyzing the volume and infiltration capacity of land units with different types of land cover in the Banyu Irang watershed in the Maluka Watershed. The method used in this research is the Horton method. Factors affecting infiltration are soil texture, soil bulk density, total soil porosity, soil organic matter, and soil moisture content. The results of the study show the value of the rate, volume dan capacity of infiltration, where the highest infiltration rate is found in the secondary forest land cover with a value of 145,5 mm/hr on land unit 19 with slope grade between 0-8% and the lowest infiltration rate is found in alang-alang (reeds) land cover with a value of 3,0 mm/hr on land units 32 with slope grade between 15-25%. The highest infiltration capacity and volume occurred in secondary forest land cover with a value of 83,490 mm/hr in land units 19. The lowest infiltration capacity and volume occurs in alang-alang (reeds) land cover with a value of 0,787 mm/hr on land units 1 and 0,846 mm/hr on land units 1.

scholarly journals Geochemical Behaviors of Rare Earth Elements (REEs) in Karst Soils under Different Land-Use Types: A Case in Yinjiang Karst Catchment, Southwest China

2021 ◽  
Vol 18 (2) ◽  
pp. 502
Author(s):  
Ruiyin Han ◽  
Zhifang Xu
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Southwest China ◽  
Secondary Forest ◽  
Soil Samples ◽  
Soil Profiles ◽  
Agricultural Activities ◽  
Soil Environment ◽  
Forest Land ◽  
Abandoned Cropland

The geochemical characteristics of rare earth elements (REEs) can be employed to identify the anthropogenic and natural influence on the distributions of REEs in soils. A total of 47 soil samples from the three soil profiles of the secondary forest land, abandoned cropland, and shrubland in the Yinjiang county of Guizhou province, southwest China, were collected to determine the contents and distribution of REEs in the soil environment. The total REEs (ΣREE) contents in different soil profiles are in the following sequence: secondary forest land (mean: 204.59 mg·kg−1) > abandoned cropland (mean: 186.67 mg·kg−1) > shrubland (mean: 139.50 mg·kg−1). The ratios of (La/Gd)N and (Gd/Yb)N ranged from 0.62 to 1.00 and 1.18 to 2.16, which indicated that the enrichment of the medium rare earth elements (MREEs) was more obvious than that of the light rare earth elements (LREEs) and the heavy rare earth elements (HREEs). The phenomenon could be attributed to the preferential absorption of MREEs by fine particles and the substitution of Ca2+ by MREEs. Most soil samples were characterized by the negative Ce anomalies (anomalies values: 0.30–1.10) and positive Eu anomalies (anomalies values: 0.43–2.90). The contents of REEs in the profiles of secondary forest land and shrubland were mainly regulated by soil pH and Fe contents while clay content and agricultural activities were the main controlling factors in the soil profile of abandoned cropland. This study highlights the role of agricultural activities in affecting the distributions of REEs in karst soils, which could provide some insights for the protection of the soil environment.

scholarly journals Association between Soil Fertility and Growth Performance of Planted Shorea macrophylla (de Vriese) after Enrichment Planting at Rehabilitation Sites of Sampadi Forest Reserve, Sarawak, Malaysia

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Mugunthan Perumal ◽  
Mohd Effendi Wasli ◽  
Ho Soo Ying ◽  
Jonathan Lat ◽  
Hamsawi Sani
Keyword(s):  
Soil Fertility ◽  
Soil Properties ◽  
Growth Performance ◽  
Tree Growth ◽  
Secondary Forest ◽  
Growth Parameters ◽  
Available Phosphorus ◽  
Forest Reserve ◽  
Enrichment Planting ◽  
Sandy Clay

A study was conducted to determine the status of soil properties after enrichment planting in comparison to an adjacent secondary forest and to evaluate the effect of enrichment planting of Shorea macrophylla (de Vriese) on the soil fertility status with special reference to Soil Fertility Index (SFI) and Soil Evaluation Factor (SEF) at Sampadi Forest Reserve, Sarawak. The study sites were stands rehabilitated in different years (1996: SM96; 1997: SM97; 1998: SM98; 1999: SM99) and secondary forest (SF). Findings indicated that the soils at rehabilitation sites and SF were strongly acidic in nature, with pH less than 5.50, poor soil exchangeable bases, and nutrient status. The soils were relatively of sandy clay loam to sandy clay. Principal Component Analysis revealed the three most significant components of the soil properties which explained 76.3% of the total variation. At surface soils, SFI was correlated with tree growth parameters of S. macrophylla, indicating that SFI is an applicable soil quality index as compared to SEF. Notwithstanding, a significant association was found between soil available phosphorus and planted S. macrophylla, indicating that soil phosphorus is a better indicator than SFI. Further studies on other environmental factors influencing tree growth performance, early establishment of experimental reforestation at nursery, and field should be implemented to obtain the initial data on seedling growth performance prior to outplanting.

Analisis Perubahan Penggunaan Lahan dan Cadangan Karbon sebagai Indikator Degradasi Lingkungan di Kecamatan Sandai Kabupaten Ketapang

2021 ◽  
Vol 19 (3) ◽  
pp. 576-581
Author(s):  
Debi Sumarlin ◽  
Evi Gusmayanti ◽  
Gusti Zakaria Anshari
Keyword(s):  
Land Use ◽  
Carbon Stock ◽  
Visual Analysis ◽  
Secondary Forest ◽  
Landsat Imagery ◽  
Land Use Changes ◽  
Carbon Stocks ◽  
Land Resources ◽  
Forest Land ◽  
Economic Activities

Sumberdaya hutan dan lahan merupakan sumberdaya yang menjadi andalan dalam aktivitas sosial ekonomi masyarakat terutama di negara berkembang. Sumber daya hutan dan lahan memiliki permasalahan seperti kegiatan konversi area hutan ke penggunaan lahan non hutan.  Tujuan penelitian ini untuk mengidentifikasi perubahan penggunaan lahan di Kecamatan Sandai pada periode 2000 sampai 2019. Selanjutnya hasil analisis digunakan untuk mengestimasi cadangan karbon. Data perubahan penggunaan lahan diperoleh dari analisis visual citra landsat, sedangkan cadangan karbon dihitung berdasarkan total luas penggunaaan lahan dengan standar cadangan karbon di setiap penggunaan lahan. Hasil analisis citra pada tahun 2019 dicocokkan dengan kondisi di lapangan. Hasil pengecekan pada 30 titik dengan kondisi terakhir penggunaan lahan tahun 2019 diperoleh kecocokan sebanyak 26 titik (87%), Ketidakcocokan terjadi karena perubahan penggunan lahan hutan sekunder menjadi kebun (1 titik), semak belukar menjadi tambang (1 titik), pertanian lahan kering menjadi lahan terbuka (1 titik) dan penggunaan lahan transmigrasi berubah menjadi semak belukar (1 titik). Penggunaan lahan yang paling dominan mengalami perubahan adalah hutan lahan kering sekunder dan perkebunan. Hutan lahan kering sekunder tahun 2000 yaitu seluas 39.931,11 ha, pada tahun 2011 menjadi 32.833,22 ha dan tahun 2019 menjadi 17.180,02 ha. Hutan lahan kering sekunder mengalami penurunan luas 22.751,09 ha dari luas 39.931,11 ha pada tahun 2000. Penggunaan lahan perkebunan tahun 2000 adalah 2.303,01 ha, mengalami penambahan luas tahun 2011 menjadi 3.996,79 dan tahun 2019 menjadi 13.937,42 ha. Penggunaan lahan perkebunan mengalami penambahan luas sebesar 13.937,42 ha dari luas 2.003,01 ha pada tahun 2000. Cadangan karbon tahun 2000 adalah 5.873,585 ton/ha, tahun 2011 menjadi 5.391,709 ton/ha dan tahun 2019 4.605,672 ton/ha. Cadangan karbon mengalami penurunan dari tahun 2000 sampai 2019 sebesar 1.267,91 ton/ha.    AbstractForest and land resources are the leading sector in the socio-economic activities of the community, especially in developing countries. Forest and land resources have problems such as the conversion of forest areas to non-forest land uses. The purpose of this study is to identify land use changes in Sandai District in the period 2000 to 2019. An analysis for above ground carbon stock also carried out in this study. Land use change data was obtained from visual analysis of Landsat imagery, while carbon stock was calculated based on the total land use area with carbon stock standards in each land use. Ground checking was carried out to validate the image in 2019 with field conditions. The results of ground checking at 30 points with the latest conditions of land use in 2019 obtained 26 points (87%), mismatches occurred due to changes in secondary forest land use to plantations (1 point), shrubs to mining (1 point), dryland agriculture to bareland (1 point) and transmigration changed to shrubs (1 point). The most dominant land use changes are secondary dryland forest and plantations. The secondary dryland forest in 2000 was 39.931,11 ha, it became 32,833.22 ha in 2011, and 17.180,02 ha in 2019. Secondary dryland forest decreased by 22.751,09 ha in 2019 from 39.931,11 ha in 2000. Plantations in 2000 was 2.303,01 ha increase to 3.996,79 in 2011 and 13,937.42 ha in 2019. Plantations increased by 13.937,42 ha in 2019 from 2.003,01 ha in 2000. Carbon stocks in 2000 were 5.873.585 tons/ha, it became 5,391,709 tons/ha in 2011 and 4,605.672 tons/ha in 2019. Carbon stocks decreased from 2000 to 2019 by 1.267,91 tons/ha.

Prediksi Laju Erosi Guna Penerapan Metode Konservasi Tanah dan Air pada Aktivitas Pertanian Daerah Lereng Warmare

Agrotek ◽  
2018 ◽  
Vol 4 (7) ◽  
Author(s):  
Isak Rumpaidus ◽  
Yohanes Sriyadi Budiyanto ◽  
Rudolf Kristian Tukayo
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Water Conservation ◽  
Secondary Forest ◽  
Soil Surface ◽  
Soil Survey ◽  
Land Evaluation ◽  
Trigger Factor ◽  
Forest Land ◽  
Surface Protection

<em>This study aims to determine the rate of soil erosion in the agricultural sloping are at Warmare to plan the improvement that can be done so that farming activities can be done without incurring great risk in the damage to the environment and human safety. The study was carried out by conducting ground survey techniques and description of the results of the soil survey and land evaluation. The prediction of erosion rates is done by using the equation of the Universal Soil Loss Equation (USLE). The results showed the actual rate of soil erosion in the area slopes Warmare for each SPT: SPT 1 (56.24 tonnes/ha/year) in the secondary forest land use, SPT 2 (2552.63 tonnes/ha/year) existing land use cultivation, SPT 3 (2325.03 tonnes/ha/year) in the area of the former land use shifting cultivation, and SPT 4 (9.88 tonnes/ha/year) on the use of secondary forest land. The main trigger factor increasing rate of soil erosion on some of SPT is the slope degree and length, as well as agriculture activity without concerning conservation. The improvement necessary for the application of soil and water conservation in the agriculture activity namely (1) slope modifications by using mechanical and civil engineering methods such as terrace, rorak and vertical mulching application; (2) soil surface protection from raindrops and runoff by �using vegetative methods; (3) cultivation techniques collaboration by using agronomic methods.</em>

scholarly journals Reproductive Phenology and Growth of Riparian Species along Phra Prong River, Sa Kaeo Province, Eastern Thailand

2017 ◽  
Vol 10 (2) ◽  
pp. 35-48
Author(s):  
Boontida Moungsrimuangdee ◽  
Panya Waiboonya ◽  
Panadda Larpkern ◽  
Prapatsorn Yodsa-Nga ◽  
Maliwan Saeyang
Keyword(s):  
Riparian Forest ◽  
Germination Rate ◽  
Early Summer ◽  
Reproductive Phenology ◽  
Wet Season ◽  
Dry Period ◽  
Riparian Species ◽  
High Germination ◽  
Dipterocarpus Alatus ◽  
Hopea Odorata

Abstract The objective of this study was to investigate the duration of flowering and fruiting and the growth of riparian species in the natural forest along Phra Prong River, Watthana Nakhon District, Sa Kaeo province. The occurrence of flowering and fruiting was recorded every month from February 2015 to January 2016 (12 months) along a 7km distance of the riversides. Sixty six species belonging to 36 families were seen flowering and fruiting in this study. They were observed during February – April. The peak of flowering and fruiting occurred in March (early summer). Hydnocarpus anthelminthicus, Uvaria rufa, and Combretum latifolium had a long lasting flowering and fruiting period. Oxystelma esculentum, Capparis micracantha, Connarus cochinchinensis, Derris scandens, and Ficus racemosa produced flowers and fruits more than once a year. Those species may play an important role in availability of food resources for animals in the riparian forest. The appropriate time to collect seeds in Phra Prong riparian forest starts from February and lasts until August. The germination test indicated that Xanthophyllum lanceatum and Crateva magna had a high germination rate, about 70%. Growth of some riparian species, including Cinnamomum iners, Dipterocarpus alatus, Hydnocarpus anthelminthicus and Hopea odorata was monitored every three months from July 2015 to June 2016. Diameter growth of D. alatus was significantly higher during the wet season (Jul-Sep) than other seasons. In contrast, the rest of the species showed no significant differences among monitoring periods. Height growth rate of C. iners was significantly highest late in the dry period (Jan-Mar).

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