Microbial biomass in soils under different tillage and crop rotation systems
Microbial biomass in soils under different tillage and crop rotation systems
复制标题
DOI：
10.1007/s00374-003-0590-9
复制
发表时间：
2003-06-01
影响因子：
6.5
通讯作者：
Dick, RP
中科院分区：
文献类型：
--
作者：
Balota, EL;Colozzi, A;Dick, RP
本文报道了不同轮作方式[大豆/小麦，S/W;玉米/小麦，M/W或棉花/小麦，C/W]和耕作方式[免耕（NT）或常规耕作（CT）]对土壤微生物生物量和其他性质的影响的长期研究。该实验于1976年在巴西南部建立，采用裂区实验设计，重复三次。1997年和1998年在0至5厘米、5至10厘米和10至20厘米深度采集土壤样品，通过直接提取法评估微生物生物量C、N、P和S。NT系统的微生物生物量C，N，P，和C（MIC）：C（org）的百分比，分别增加了103%，54%，36%和44%，在0至5厘米的深度。NT系统也增加了C：N：S：P比值。这些结果为耕作或轮作影响土壤养分的微生物固定提供了证据。固定在微生物生物量中的C的量较大，表明NT系统下的土壤有机质比CT系统提供更高水平的更不稳定的C。
A long-term study on the effect of different crop rotations [soybean/wheat, S/W; maize/wheat, M/W or cotton/wheat, C/W] and tillage regimes [no-tillage (NT) or conventional tillage (CT)] on microbial biomass and other soil properties is reported. The experiment was established in 1976 in southern Brazil as a split-plot experimental design in three replications. Soil samples were taken in 1997 and 1998 at 0- to 5-, 5- to 10- and 10- to 20-cm depths and evaluated for microbial biomass C, N, P and S by direct extraction methods. The NT system showed increases of 103%, 54%, 36%, and 44% for microbial biomass C, N, P, and C(mic):C(org) percentage, respectively at the 0- to 5-cm depth. NT systems also increased the C to N:S:P ratios. These results provide evidence that tillage or crop rotation affect microbial immobilization of soil nutrients. The larger amount of C immobilized in microbial biomass suggests that soil organic matter under NT systems provides higher levels of more labile C than CT systems.