Soil aggregates and fractal features under different land use types in a frequent debris flow area

Land use change is extremely sensitive to natural factors and human influence in active debris flow. It is therefore necessary to determine the factors that influence land use change. This paper took Wudu District, Gansu Province, China as a study area, and a systemic analysis of the transformational extent and rate of debris flow waste-shoal land (DFWSL) was carried out from 2005 to 2015. The results show that from 2005 to 2015, cultivated land resources transformed to other types of land; cultivated lands mainly transformed to grassland from 2005 to 2010 and construction land from 2010 to 2015. Moreover, the growth rate of construction land from 2005 to 2010 was only 0.11%, but increased to 6.87% between 2010 and 2015. The latter is more than 60 times the former. This increase was brought about by natural disasters (debris flow, earthquakes, and landslides) and anthropogenic factors (national policies or strategies), which acted as driving forces in debris flow area. The former determines the initial use type of the DFWSL while the latter only affects the direction of land use and transformation.

Download Full-text

Nitrogen addition reduced carbon mineralization of aggregates in forest soils but enhanced in paddy soils in South China

Ecological Processes ◽

10.1186/s13717-021-00319-z ◽

2021 ◽

Vol 10 (1) ◽

Author(s):

Ruirui Cao ◽

Longchi Chen ◽

Xincun Hou ◽

Xiaotao Lü ◽

Haimei Li

Keyword(s):

Land Use ◽

Forest Soils ◽

Soil Aggregates ◽

Paddy Soils ◽

N Addition ◽

C Mineralization ◽

Organic C ◽

Soil C ◽

Land Use Types ◽

Soc Mineralization

Abstract Background Despite the crucial role of nitrogen (N) availability in carbon (C) cycling in terrestrial ecosystems, soil organic C (SOC) mineralization in different sizes of soil aggregates under various land use types and their responses to N addition is not well understood. To investigate the responses of soil C mineralization in different sized aggregates and land use types to N addition, an incubation experiment was conducted with three aggregate-size classes (2000, 250, and 53 μm) and two land use types (a Chinese fir plantation and a paddy land). Results Cumulative C mineralization of the < 53-μm fractions was the highest and that of microaggregates was the lowest in both forest and paddy soils, indicating that soil aggregates enhanced soil C stability and reduced the loss of soil C. Cumulative C mineralization in all sizes of aggregates treated with N addition decreased in forest soils, but that in microaggregates and the < 53-μm fraction increased in paddy soils treated with 100 μg N g−1. Moreover, the effect sizes of N addition on C mineralization of forest soils were below zero, but those of paddy soils were above zero. These data indicated that N addition decreased SOC mineralization of forest soils but increased that of paddy soils. Conclusions Soil aggregates play an important role in soil C sequestration, and decrease soil C loss through the increase of soil C stability, regardless of land use types. N addition has different effects on soil C mineralization in different land use types. These results highlight the importance of soil aggregates and land use types in the effects of N deposition on the global terrestrial ecosystem C cycle.

Download Full-text

Analysis of material supply characteristics of debris flow based on land use types in the upper Min River, China

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/861/5/052017 ◽

2021 ◽

Vol 861 (5) ◽

pp. 052017

Author(s):

Mingtao Ding ◽

Guohui Yang ◽

Zemin Gao ◽

Tao Huang

Keyword(s):

Land Use ◽

Debris Flow ◽

Material Supply ◽

Min River ◽

Land Use Types

Download Full-text

LAND USE TYPES AND SOIL CHARACTERISTICTS: A CASE STUDY IN HUONG VINH COMMUNE, HUONG TRA TOWN, THUA THIEN HUE PROVINCE

HUE UNIVERSITY JOURNAL OF SCIENCE EARTH SCIENCE AND ENVIRONMENT ◽

10.26459/hujos-ese.v126i4b.4121 ◽

2017 ◽

Vol 126 (4B) ◽

Author(s):

Trần Thanh Đức

Keyword(s):

Land Use ◽

Sweet Potato ◽

Soil Analysis ◽

Soil Characteristics ◽

Low Ph ◽

Clay Loam ◽

Total N ◽

Land Use Types ◽

Total P

This research carried out in Huong Vinh commune, Huong Tra town, Thua Thien Hue province aimed to identify types of land use and soil characteristics. Results showed that five crops are found in Huong Vinh commune including rice, peanut, sweet potato, cassava and vegetable. There are two major soil orders with four soil suborders classified by FAO in Huong Vinh commune including Fluvisols (Dystric Fluvisols, Gleyic Fluvisols and Cambic Fluvisols) and Arenosols (Haplic Arenosols). The results from soil analysis showed that three soil suborders including Dystric Fluvisols, Gleyic Fluvisols and Cambic Fluvisols belonging to Fluvisols were clay loam in texture, low pH, low in OC, total N, total P2O5 and total K2O. Meanwhile, the Haplic Arenosols was loamy sand in texture, poor capacity to hold OC, total N, total P2O5 and total K2O

Download Full-text

Bat Community Responses to Structural Habitat Complexity Resulting from Management Practices Within Different Land Use Types — A Case Study from North-Eastern Germany

Acta Chiropterologica ◽

10.3161/15081109acc2018.20.2.010 ◽

2019 ◽

Vol 20 (2) ◽

pp. 387 ◽

Cited By ~ 4

Author(s):

Nicole Starik ◽

Thomas Göttert ◽

Emanuel Heitlinger ◽

Ulrich Zeller

Keyword(s):

Land Use ◽

Habitat Complexity ◽

Management Practices ◽

Community Responses ◽

Eastern Germany ◽

Land Use Types ◽

North Eastern ◽

Structural Habitat

Download Full-text

THE IMPACT OF DIFFERENT URBAN LAND USE TYPES ON AIR POLLUTION IN THE MEGACITY OF SÃO PAULO

Revista Presença Geográfica ◽

10.36026/rpgeo.v7i1.5366 ◽

2020 ◽

Vol 7 (1) ◽

pp. 91

Author(s):

Júlio Barboza Chiquetto ◽

Maria Elisa Siqueira Silva ◽

Rita Yuri Ynoue ◽

Flávia Noronha Dutra Ribieiro ◽

Débora Souza Alvim ◽

...

Keyword(s):

Land Use ◽

Air Pollution ◽

Urban Land ◽

Sao Paulo ◽

Urban Land Use ◽

São Paulo ◽

Land Use Types ◽

The Impact

A poluição do ar é influenciada por fatores naturais e antropogênicos. Quatro pontos de monitoramento (veicular, comercial, residencial e background urbano (BGU))da poluição do ar em São Paulo foram avaliados durante 16 anos, revelando diferenças significativas devidoao uso do solo em todas as escalas temporais. Na escala diurna, as concentrações de poluentes primários são duas vezes mais altas nos pontos veicular e residencial do que no ponto BGU, onde a concentração de ozonio (O3) é 50% mais alta. Na escala sazonal, as concentrações de monóxido de carbono(CO) variaram em 80% devido ao uso do solo, e 55% pela sazonalidade.As variações sazonais ede uso do solo exercem impactos similares nas concentrações de O3 e monóxido de nitrogênio (NO). Para o material particulado grosso (MP10) e o dióxido de nitrogênio(NO2), as variações sazonais são mais intensas do que as por uso do solo. Na série temporal de 16 anos, o ponto BGU apresentou correlações mais fortes e significativas entre a média mensal de ondas longas (ROL) e o O3 (0,48) e o MP10 (0,37), comparadas ao ponto veicular (0,33 e 0,22, respectivamente). Estes resultados confirmam que o uso do solo urbano tem um papel significativo na concentração de poluentes em todas as escalas de análise, embora a sua influência se torne menos pronunciada em escalas maiores, conforme a qualidade do ar transita de um sistema antropogênico para um sistema natural. Isto poderá auxiliar decisões sobre políticas públicas em megacidades envolvendo a modificação do uso do solo.

Download Full-text