Temporal Effects of Gravel-Sand Mulching on Soil Microbial Population and Soil Enzyme Activity in Croplands with Continuous Cultivation

Qiu Yang; Wang Ya-jun; Xie Zhong-kui; Zhang Ya-juan

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Temporal Effects of Gravel-Sand Mulching on Soil Microbial Population and Soil Enzyme Activity in Croplands with Continuous Cultivation

- Temporal Effects of Gravel-Sand Mulching on Soil Microbial Population and Soil Enzyme Activity in Croplands with Continuous Cultivation
- Bulletin of Soiland Water Conservation Vol. 30, Issue 5, Pages: 65-68(2011)
- 作者机构：
  
  中国科学院寒区旱区环境与工程研究所
- 作者简介：
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- Published：2011
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Qiu Yang, Wang Ya-jun, Xie Zhong-kui, et al. Temporal Effects of Gravel-Sand Mulching on Soil Microbial Population and Soil Enzyme Activity in Croplands with Continuous Cultivation[J]. Bulletin of Soiland Water Conservation, 2011, 30(5): 65-68.
DOI：

Qiu Yang, Wang Ya-jun, Xie Zhong-kui, et al. Temporal Effects of Gravel-Sand Mulching on Soil Microbial Population and Soil Enzyme Activity in Croplands with Continuous Cultivation[J]. Bulletin of Soiland Water Conservation, 2011, 30(5): 65-68. DOI：

摘要

以中国科学院皋兰试验站的连续砾石覆盖2

15和20a的连作西瓜农田为对象

对不同覆盖年限连作西瓜农田土壤中微生物数量、过氧化氢酶、淀粉酶、蔗糖酶、多酚氧化酶、脱氢酶酶活性进行了研究。结果表明

随着砾石覆盖年限的增加

土壤微生物数量逐渐降低

在覆盖7～11a时最为稳定

此后微生物多样性指数和均匀度指数持续降低。在0～20a范围内

砾石覆盖下多数土壤酶活性随着覆盖年限的延长呈抛物线变化趋势

在砾石覆盖10～11a之前呈上升趋势

随后呈下降趋势。总体而言

在砾石覆盖11a左右的农田中

土壤酶活性最高

砾石覆盖超过15a的农田土壤酶活性较低

作物减产

需要停耕堆肥

重新换沙来维持产量。这一结果可为砾石覆盖农田土壤的持续利用与科学管理提供基础依据。

Abstract

Soil samples collected from continuous croplands with 2

15and 20year gravel-sand mulching in Gaolan Research Station

Gansu Province were analyzed for soil microbial population and soil enzyme activities. The results show that with increase of mulching time

soil microbial population decreased from the beginning to a low stable state in about 7to 11years

and then the Shannon diversity index and Mclntosh diversity index continued to decrease.The enzyme activities of soils showed a parabola curve over time.Most of them increased and reached their peaks in 10to 11years

and then declined.The soil enzyme activity of the cropland covered for more than 15years was so low that the yield of the crops decreased.At this stage

farming practices should be stopped

and compost should be added with renewal of soil sand to recover the productivity of the land.The results of the study can provide a theoretical basis for the sustainable utilization and management of the gravel-sand mulched croplands.

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