KMS Chongqing Institute of Green and Intelligent Technology, CAS
Conservative agriculture facilitates soil carbon, nitrogen accumulation, and aggregate stabilization under periodic flooding regimes | |
Ran, Yiguo1,2; Zhu, Kai1; Wu, Shengjun1; Zhou, Yue1; Li, Wenjuan1,2; Ma, Maohua1; Huang, Ping1 | |
2022-02-01 | |
摘要 | Aggregates play crucial roles in protecting soil carbon (C) and nitrogen (N) loss since aggregates could mediate the effect of environmental factors on the C and N accumulation. As ecotone habitats, reservoir riparian zones undergo disturbances from both land use and dam-regulated flooding, which could pose threats to aggregate stability. Yet, we know little about the effects of the flooding intensity and land use on the dynamics of soil C and N, as well as the mediating role of soil aggregates. In this study, along a flooding gradient, firstly we examined the effects of seven land-use types (corn, rice paddy, and vegetable lands; Chinese fir, willow, and mulberry restored lands; and grassland) on soil C and N accumulation; secondly, we identified the size distribution and stability of aggregates in mediating the effect of riparian land uses under periodic flooding regimes. We found that the C and N concentrations in soil aggregate fractions were all significantly impacted by land-use types, and aggregate-size distribution showed tight links with both land-use types and C and N contents. Conservative farmlands contained a higher proportion of macro-aggregates which stores significantly higher C and N concentrations than micro-aggregates. Notably, higher aggregate stability was also found in conservative farmland. We concluded that, in the riparian ecotone, conservative farming promotes C and N accumulation via stabilizing aggregate fractions, and suggested the conservative practices could be acceptable for soil conservation considering the scarcity of land resources in the ambient mountainous regions. |
关键词 | Riparian land use Flooding regime C and N accumulation Soil structural stability The dammed-reservoir |
DOI | 10.1016/j.catena.2021.105783 |
发表期刊 | CATENA |
ISSN | 0341-8162 |
卷号 | 209页码:11 |
通讯作者 | Ma, Maohua(mamaohua@cigit.ac.cn) ; Huang, Ping(huangping@cigit.ac.cn) |
收录类别 | SCI |
WOS记录号 | WOS:000711850200001 |
语种 | 英语 |