Effects of cropping systems on soil organic matter in a pair of conventional and biodynamic mixed cropping farms in Canterbury, New Zealand

被引：0

作者：

T. Murata

K. M. Goh

机构：

[1] Department of Soil Science,

[2] Faculty of Agriculture,undefined

[3] Tokyo University of Agriculture and Technology,undefined

[4] Fuchu,undefined

[5] Tokyo 183,undefined

[6] Japan,undefined

[7] Department of Soil Science,undefined

[8] Lincoln University,undefined

[9] PO Box 84,undefined

[10] Canterbury,undefined

[11] New Zealand Fax: +64 (3) 325 3607,undefined

来源：

Biology and Fertility of Soils | 1997年 / 25卷

关键词：

Key words Cropping systems; Biodynamic farms; Soil organic matter fractions; Microbial biomass; Soil quality indicators;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Effects of cropping systems on soil organic matter (SOM) in a pair of conventional and biodynamic mixed cropping farms were investigated. Soil samples (0–75 and 75–150-mm depths) were analysed for total carbon (TC), total nitrogen (TN), microbial biomass C (BC) and microbial biomass N (BN), and sequentially extracted for labile and stable SOM using cold water, hot water, acid mixtures and alkalis. In the biodynamic farm, TC and TN decreased with increasing period of cropping but the reverse occurred under pastures. These were not shown in soils from the conventional farm, probably due to N fertilizer additions. Under pastures, increases in SOM were attributed to greater biological N2 fixation and the return of plant residues and excreta from grazing animals. Overall, sensitive SOM quality indicators found for labile SOM were BN, BN:TN and HC:TC, and for stable SOM were HCl/HFC, HCl/HFC:TC, humin C, humin N, humin C:TC and humin N:TN. The BN and BN:TN were better indicators than BC and BC:TC. The humin fraction was strongly related to both labile and stable SOM fractions suggesting that humin contained non-extractable strongly complexed SOM components with mineral matter and also non-extractable plant and microbial residual components.

引用

页码：372 / 381

页数：9