期刊
SOIL & TILLAGE RESEARCH
卷 181, 期 -, 页码 110-116出版社
ELSEVIER
DOI: 10.1016/j.still.2018.04.009
关键词
Sod cultivation; Floor management in orchards; SOC stabilization
类别
资金
- Foundation for High-level Talents in Higher Education of Guangdong, China [246]
- Science and Technology Program of Guangdong Province, China [2015B090903077, 2015A020215021]
- National Natural Science Foundation of China [31500401]
- Natural Science Foundation of Guangdong Province, China [2014A030310354]
Understory management is evidently important for improving the ecological and economic effects of orchards, and grass maintenance in orchards is a potentially preferable floor management measure relative to clean tillage. It is widely accepted that grass maintenance increases soil organic carbon (SOC) content, but whether different SOC fractions respond consistently is less understood. To clarify the potential effects of grass maintenance on SOC fractions, three grass species, including a leguminous species (Stylosanthes guianensis cv. Reyan) and two gramineous species (Paspaltun notation Alain ear Flugge. and Pennisetum americanum x P. puipureum), were planted under young Litchi trees in a subtropical orchard of southern China for eight months using clean tillage as a control. The labile and non-labile SOC fractions and microbial C mineralization were investigated. Relative to the control, grass cultivation significantly increased or trended to increase the SOC content and this was mainly due to increases in the labile SOC fractions. The increased C lability and substrate supply support higher soil microbial biomass C, consequently accelerating the soil C mineralization process and resulting in a greater biologically mineralizable C pool. However, grass cultivation significantly decreased the non-readily oxidizable OC content, although it was relatively more chemically recalcitrant. Our results suggest that grass cultivation may favorably accelerate nutrient cycling in orchards due to higher labile C substrate availability and soil microbial biomass and activity. Nevertheless, grass cultivation could decrease SOC stabilization as indicated by the increased SOC lability in the grass-planting systems.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据