MICROBIAL BIOMASS AND ACTIVITY OF A RECLAIMED-POLDER SOIL UNDER A CONVENTIONAL OR A REDUCED-INPUT FARMING SYSTEM

被引:57
作者
HASSINK, J [1 ]
LEBBINK, G [1 ]
VANVEEN, JA [1 ]
机构
[1] INST TOEPASSING ATOOMENERGIE LAB,INST RES,6700 AA WAGENINGEN,NETHERLANDS
关键词
D O I
10.1016/0038-0717(91)90107-U
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The size and activity of the microbial biomass were measured during 3 yr in two fields. One field was cultivated as a reduced-input farming system, the other as a conventional system. In the top 25 cm the size and activity of the biomass were greater in the reduced-input field. Below a depth of 40 cm no differences were apparent. There were still substantial amounts of biomass and considerable microbial activity to a depth of 1 m. Compared with the field treated as a conventional system, the relative increases in total N, N flush and N-mineralisation rate in the reduced-input field were greater than the relative increases in organic C, microbial biomass C and C respiration. In the case of C, the relative increases in the reduced-input field were greater for microbial activity (respiration) than for organic C and microbial biomass C. Microbial biomass decreased with increasing soil moisture stress and increased strongly after remoistening of the soil.
引用
收藏
页码:507 / 513
页数:7
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