[Effects of"Grain for Green "on the Spatial Distribution of Soil Carbon and Nitrogen in Purple Hilly Area of China].
Huan Jing Ke Xue
; 45(7): 4206-4217, 2024 Jul 08.
Article
em Zh
| MEDLINE
| ID: mdl-39022967
ABSTRACT
In order to remedy the lack of research on the effect of "Grain for Green" on soil carbon ï¼Cï¼ and nitrogen ï¼Nï¼ distribution on slope soil in purple hilly areas of Sichuan Basin, China, a study was conducted on a long-term observation site established in the Wanan small watershed of Yanting Agro-ecological Experimental Station of Purple Soil, Chinese Academy of Sciences. The morphology, content, and storage of C and N in soil at different slope positions of farmland and the artificial forests in rehabilitated land with a history of approximately 30 years were compared. Our results showed that "Grain for Green" significantly increased soil organic carbon ï¼SOCï¼ content and SOC stock in all soil layers. The SOC stock of the surface layer ï¼0-20 cmï¼ increased by 25.86 t·hm-2, and the annual SOC stocks ratio was 0.89 t·hm-2. Soil total nitrogen ï¼TNï¼ content increased slightly but only in the 0-20 cm soil layer. Compared with those in sloping farmland, the differences in available C and N nutrients such as soil nitrate N ï¼NO3--Nï¼, ammonia N ï¼NH4+-Nï¼, and dissolved organic C ï¼DOCï¼ in the whole soil profile ï¼0-70 cmï¼ were basically not significant ï¼P > 0.05ï¼. In addition, our research also found that slope position had significant effects on the contents of TN, SOC, NO3--N, NH4+-N, and DOC in farmland soil ï¼P< 0.05ï¼. The variation trend of soil NO3--N, NH4+-N, and DOC contents along the slope was as followsï¼ upper slope < middle slope < lower slope, whereas the soil TN and SOC contents were highest in the lower slope, followed by the upper slope and middle slope. The position of the slope had a significant impact only on DOC content in forest soil, which increased along the slope. This research indicated that when evaluating the impact of land use changes on soil C and N stocks in the purple soil hilly region, the influence of topographic factors cannot be ignored.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
Zh
Revista:
Huan Jing Ke Xue
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
China