Effect of household land management on cropland topsoil organic carbon storage at plot scale in a red earth soil area of South China.
Effect of household land management on cropland topsoil organic carbon storage at plot scale in a red earth soil area of South China.
复制标题
华南红壤区农户土地管理对地块尺度耕地表土有机碳储量的影响
DOI：
10.1017/s0021859611000323
复制
发表时间：
2011-10
影响因子：
2
通讯作者：
Zhang, X.
中科院分区：
文献类型：
--
作者：
Feng, S.;Tan, S.;Zhang, A.;Zhang, Q.;Pan, G.;Qu, F.;Smith, P.;Li, L.;Zhang, X.
摘要 2003年，对中国江西省红土区的一个村庄进行了家庭农场表层土壤有机碳（SOC）含量的调查。在该地区，每个家庭经营的农田都是分散的，由几块不一定相邻的土地组成。对 SOC 随土地利用和家庭管理类型以及作物管理实践的变化进行了统计分析。地块面积范围为 0·007 至 0·630 公顷，平均为 0·1 公顷，SOC 含量范围为 1·72 至 25·2 g/kg，随个人家庭行为产生的各种土地管理和农业实践而变化很大。地块面积 <0·1 ha 的平均 SOC 含量比地块面积≥0·1 ha 的平均 SOC 含量低 20%。旱作地块的 SOC 比稻田低 70%，从村里承包的地块的 SOC 几乎是从其他户租用的地块的 2 倍。此外，种植绿肥可使 SOC 增加 30%，三熟可增加 55%。最不利和最有利的家庭土地管理和农业实践案例之间的 SOC 水平差异高达 150%。结果表明，如果家庭土地管理得不到改善，仅针对作物管理的政策可能无法带来预期的 SOC 效益。
SUMMARY An inventory of topsoil soil organic carbon (SOC) content in household farms was performed in a village from a red earth region in Jiangxi Province, China in 2003. In this region, the farmland managed by each household is fragmented, consisting of several plots of land that are not necessarily adjacent to each other. A statistical analysis of SOC variation with land use and household management type, and with crop management practices was conducted. Plot size ranged from 0·007 to 0·630 ha with a mean of 0·1 ha, and SOC content ranged from 1·72 to 25·2 g/kg, varying widely with a variety of land management and agricultural practices, arising from individual household behaviours. The mean SOC content in plot size <0·1 ha was 20% lower than in plot size ⩾0·1 ha. SOC of dry crop plots was 70% lower than that in rice paddies, and SOC of plots contracted from the village was almost double that of plots leased from other householders. Moreover, a 30% increase in SOC was observed with green manure cultivation, and a 55% increase under triple cropping. The difference in SOC levels between the least and most favourable cases of household land management and agricultural practice was up to 150%. The results suggest that policies targeted at crop management alone may not deliver the expected SOC benefits if household land management is also not improved.