Stand age-related effects on soil respiration in rubber plantations (Hevea brasiliensis ) in southwest China

2019 ◽  
Vol 70 (6) ◽  
pp. 1221-1233 ◽  
Author(s):  
Jinbo Gao ◽  
Yiping Zhang ◽  
Qinghai Song ◽  
Youxing Lin ◽  
Ruiwu Zhou ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Hevea Brasiliensis ◽  
Southwest China ◽  
Stand Age ◽  
Rubber Plantations ◽  
Age Related

Stand age-related effects on soil respiration in a first rotation Sitka spruce chronosequence in central Ireland

2006 ◽  
Vol 0 (0) ◽  
pp. 070621084512039-???
Author(s):  
GUSTAVO SAIZ ◽  
KENNETH A. BYRNE ◽  
KLAUS BUTTERBACH-BAHL ◽  
RALF KIESE ◽  
VIOREL BLUJDEA ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Sitka Spruce ◽  
Stand Age ◽  
Age Related

Stand age-related effects on soil respiration in a first rotation Sitka spruce chronosequence in central Ireland

2006 ◽  
Vol 12 (6) ◽  
pp. 1007-1020 ◽  
Author(s):  
GUSTAVO SAIZ ◽  
KENNETH A. BYRNE ◽  
KLAUS BUTTERBACH-BAHL ◽  
RALF KIESE ◽  
VIOREL BLUJDEA ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Sitka Spruce ◽  
Stand Age ◽  
Age Related

scholarly journals Increased Litter Greatly Enhancing Soil Respiration in Betula platyphylla Forests of Permafrost Region, Northeast China

Forests ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 89
Author(s):  
Hong Wei ◽  
Xiuling Man
Keyword(s):  
Soil Respiration ◽  
Carbon Cycle ◽  
Soil Carbon ◽  
Northeast China ◽  
Stand Age ◽  
Permafrost Region ◽  
Betula Platyphylla ◽  
Litter Input ◽  
Litter Manipulation ◽  
And Control

The change of litter input can affect soil respiration (Rs) by influencing the availability of soil organic carbon and nutrients, regulating soil microenvironments, thus resulting in a profound influence on soil carbon cycle of the forest ecosystem. We conducted an aboveground litterfall manipulation experiment in different-aged Betula platyphylla forests (25-, 40- and 61-year-old) of the permafrost region, located in the northeast of China, during May to October in 2018, with each stand treated with doubling litter (litter addition, DL), litter exclusion (no-litter, NL) and control litter (CK). Our results indicated that Rs decreased under NL treatment compared with CK treatment. The effect size lessened with the increase in the stand age; the greatest reduction was found for young Betula platyphylla forest (24.46% for 25-year-old stand) and tended to stabilize with the growth of forest with the reduction of 15.65% and 15.23% for 40-and 61- year-old stands, respectively. Meanwhile, under DL treatment, Rs increased by 27.38%, 23.83% and 23.58% on 25-, 40- and 61-year-old stands, respectively. Our results also showed that the increase caused by DL treatment was larger than the reduction caused by NL treatment, leading to a priming effect, especially on 40- and 61-year-old stands. The change in litter input was the principal factor affecting the change of Rs under litter manipulation. The soil temperature was also a main factor affecting the contribution rate of litter to Rs of different-aged stands, which had a significant positive exponential correlation with Rs. This suggests that there is a significant relationship between litter and Rs, which consequently influences the soil carbon cycle in Betula platyphylla forests of the permafrost region, Northeast China. Our finding indicated the increased litter enhanced the Rs in Betula platyphylla forest, which may consequently increase the carbon emission in a warming climate in the future. It is of great importance for future forest management in the permafrost region, Northeast China.

scholarly journals Changes in mean forest age in Canada’s forests could limit future increases in area burned but compromise potential harvestable conifer volumes

2017 ◽  
Vol 47 (6) ◽  
pp. 755-764 ◽  
Author(s):  
Yan Boulanger ◽  
Martin Girardin ◽  
Pierre Y. Bernier ◽  
Sylvie Gauthier ◽  
André Beaudoin ◽  
...  
Keyword(s):  
Simulation Models ◽  
Stand Age ◽  
Almost Everywhere ◽  
Age Related ◽  
New Information ◽  
Simple Simulation ◽  
Regional Vulnerability ◽  
Vegetation Feedbacks ◽  
Burning Rates ◽  
Negative Impacts

Forest fire activity is projected to increase with climate change in Canada, but vegetation feedbacks are usually not considered. Using new information on the selectivity or avoidance of fire as a function of stand age and composition, we ran simple simulation models that consider the changes in the regional age matrices induced by fire and harvesting to project future burn rates. We also projected estimated future regional vulnerability of timber supply to fire by considering these new burn rates. The inclusion of age-related feedbacks would have a large impact on projected increases in burn rates, mostly in a very fire active zone under aggressive climate forcing. Projected burn rates would still increase, but would be 50% less in 2100 than if projected without this biotic feedback in some zones. Negative feedbacks would be virtually nonexistent when potential burning rates are below 1%, whereas realized burning rates would be lowered by more than a 0.5 percentage point when potential burning rates exceed 2.5%. Including fire–vegetation feedbacks had virtually no impact on total volume harvested. As fire burns more old-growth coniferous stands, slightly negative impacts were projected on conifer harvested almost everywhere. These results underline the need to incorporate fire–vegetation feedbacks when projecting future burn rates.

Comparison of soil respiration among three temperate forests in Changbai Mountains, China

2010 ◽  
Vol 40 (4) ◽  
pp. 788-795 ◽  
Author(s):  
Xu Wang ◽  
Yanling Jiang ◽  
Bingrui Jia ◽  
Fengyu Wang ◽  
Guangsheng Zhou
Keyword(s):  
Soil Respiration ◽  
Soil Temperature ◽  
Secondary Forest ◽  
Temperature Response ◽  
Stand Age ◽  
Changbai Mountains ◽  
Primary Forest ◽  
Plantation Forest ◽  
Successional Stage ◽  
Coniferous Plantation

CO2 efflux from forest soils is an important process in the global carbon cycle; however, effects of stand age and successional status remain uncertain. We compared soil respiration and its relationship to soil carbon content, forest floor mass, root biomass, soil temperature, and soil moisture content among three temperate forest ecosystems in Changbai Mountains, northeastern China, from 2003 to 2005. Forest types included an old-growth, mixed coniferous and broad-leaved primary forest (MN), a middle-aged, broad-leaved secondary forest (BL), and a young coniferous plantation forest (CP). Average annual soil CO2 efflux at BL (1477.9 ± 61.8 g C·m–2·year–1) was significantly higher than at CP (830.7 ± 48.7 g C·m–2·year–1) and MN (935.4 ± 53.3 g C·m–2·year–1). Differences in soil temperature among those sites were not statistically significant but contributed to the differences in annual CO2 efflux. In addition, the temperature response of soil CO2 efflux was higher at MN (Q10 = 2.78) than that at BL (Q10 = 2.17) and CP (Q10 = 2.02). Our results suggest that successional stage affects soil respiration by the differences in substrate quantity and quality, environmental conditions, and root respiration.

scholarly journals Determination of the Influence of Cultural Techniques "Densities and Opening Standardʺ on Agrophysiological Parameters of Clones Pb 260, Irca 111 and Rrim 703

2021 ◽  
pp. 31-39
Author(s):  
Diarrassouba Moussa ◽  
Soumahin Eric Francis ◽  
Konan Djézou ◽  
N’guessan Kan Pulchérie ◽  
Moro Affia Perpetue ◽  
...  
Keyword(s):  
Experimental Design ◽  
Hevea Brasiliensis ◽  
Normal Density ◽  
Low Density ◽  
Annual Increase ◽  
Rubber Plantations ◽  
Average Annual Increase ◽  
Sustainable Improvement ◽  
Cultivation Techniques

To find out the effect of cultural techniques on agrophysiological parameters, four combinations ̏planting densities (low density or DF at 350 t/ha, normal density or DN at 510 t/ha) and opening standards (opening at 65cm and opening at 50 cm) ̋ were tested on Hevea brasiliensis clones PB 260, IRCA 111 and RRIM 703. This study was conducted for nine years with a split-plot experimental design of two treatments and two subtreatments repeated three times. The different combinations of treatments and subtreatments tested were low density (DN-50 cm), low density (DN-65 cm), normal density (DF-50 cm), normal density (DF- 65 cm). The parameters evaluated were the production at bleeding and per hectare, the average annual increase in circumference, the rate of tree losses and the rate of trees with dry notches. Production per tree was significantly higher at 350 t/ha and 65 cm opening (DF-65 cm), while per hectare production was higher at 510 t/ha. The girths of the different clones are stronger at DF and at the 65 cm opening. The rate of tree loss and the rate of trees with dry notch were low at the 510 t/ha density and the 65cm opening. The appropriate density and opening standard was "normal density 510 t/ha and opening to circumference 50 cm". The cultivation techniques especially the density and opening standard judiciously applied can participate in the sustainable improvement of rubber productivity of rubber plantations.

Effects of stand age on soil respiration in Pinus massoniana plantations in the hilly red soil region of Southern China

CATENA ◽  
2019 ◽  
Vol 178 ◽  
pp. 313-321 ◽  
Author(s):  
Kunyong Yu ◽  
Xiong Yao ◽  
Yangbo Deng ◽  
Zhuangjie Lai ◽  
Lingchen Lin ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Southern China ◽  
Pinus Massoniana ◽  
Red Soil ◽  
Stand Age ◽  
Hilly Red Soil Region

scholarly journals Soil respiration and net ecosystem productivity in a chronosequence of hybrid poplar plantations

2020 ◽  
Vol 100 (4) ◽  
pp. 488-502
Author(s):  
Scott X. Chang ◽  
Zheng Shi ◽  
Barb R. Thomas
Keyword(s):  
Soil Respiration ◽  
Soil Temperature ◽  
Populus Deltoides ◽  
Hybrid Poplar ◽  
Stand Age ◽  
Net Ecosystem Productivity ◽  
Ecosystem Productivity ◽  
Short Rotation ◽  
C Dynamics ◽  
Woody Crop

Forest stand age can affect ecosystem carbon (C) cycling and net ecosystem productivity (NEP). In Canada, establishment of short-rotation plantations on previously agricultural lands has been ongoing, but the effect of stand development on soil respiration (Rs) and NEP in such plantations is poorly understood. These types of data are essential for constraining ecosystem models that simulate C dynamics over the rotation of a plantation. We studied Rs (including autotrophic, Ra, and heterotrophic, Rh) and NEP in 2008 and 2009 in a chronosequence of 5-, 8-, 14-, and 16-yr-old (ages in 2009) hybrid poplar (Populus deltoides × Populus × petrowskyana var. Walker) plantations in northern Alberta. The highest Rs and NEP were generally found in the 14-yr-old stand. Seasonal variations in Rs were similar among the plantations, with most of the variation explained by soil temperature at the 10 cm depth in 2008 with far less explained in 2009, a much drier year. In diurnal measurements, hysteresis was found between soil respiration and soil temperature, with the patterns of hysteresis different among stand ages. Soil respiration in the 14-yr-old plantation had the greatest sensitivity to temperature changes. Stand age did not affect the Rh:Rs ratio, whereas the NEP exhibited strong inter-annual variability. We conclude that stand age was a major factor affecting Rs and NEP, and such effects should be considered in empirical models used to simulate ecosystem C dynamics to evaluate potentials for C sequestration and the C source–sink relationship in short-rotation woody crop systems.

scholarly journals Comparison of Soil Microbial Composition and Diversity Between Mixed and Monoculture Rubber Plantations in Hainan Province, China

2019 ◽  
Vol 12 ◽  
pp. 194008291987607 ◽  
Author(s):  
Muhammad Tahir Jatoi ◽  
Guoyu Lan ◽  
Zhixiang Wu ◽  
Rui Sun ◽  
Chuan Yang ◽  
...  
Keyword(s):  
Soil Ph ◽  
Hevea Brasiliensis ◽  
Fungal Communities ◽  
Rubber Plantation ◽  
Sequencing Analysis ◽  
Microbial Composition ◽  
Bacterial Composition ◽  
Rubber Plantations ◽  
Significant Difference ◽  
Soil Bacterial

This study aimed to compare monoculture and mixed rubber plantations in terms of their soil bacterial and fungal composition. An Illumina MiSeq sequencing analysis was performed to investigate the composition and diversity of the soil bacterial and fungal communities among three different rubber ( Hevea brasiliensis) plantations: monoculture, Mixed 1 ( Hevea brasiliensis and Mytilaria laosensis), and Mixed 2 ( Hevea brasiliensis and Michelia macclurei) in Hainan. The results showed that the bacterial composition of the three rubber plantations was basically similar. However, there was a significant difference in fungal communities among the three rubber plantations at both the phylum and operational taxonomic unit level. The species richness, Chao, and Shannon diversity of bacterial communities of monoculture rubber plantations were higher than the Mixed 1 and Mixed 2 rubber plantations, whereas all diversity indexes of fungal communities were relatively equal for the monoculture and mixed rubber plantations. Soil nutrition (such as total nitrogen and total potassium) and soil pH are the main drivers of the bacterial composition ( p <  .001). However, soil pH and water content are the main drivers of the fungal composition ( p <  .001), and to some extent, soil pH can increase soil bacteria diversity. We suggest that alkaline fertilizers should be applied in mixed rubber plantations to improve the soil pH and, consequently, to increase the total diversity of the rubber plantation.

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