干旱区生态环境知识资源中心(Arid): 黄土区地膜覆盖对麦田土壤微生物体碳的影响

Arid

	黄土区地膜覆盖对麦田土壤微生物体碳的影响
其他题名	Effect of plastic film mulching on soil microbial biomass in spring wheat field in semi-arid loess area
	宋秋华; 李凤民; 刘洪升; 王俊; 李世清
来源期刊	应用生态学报
ISSN	1001-9332
出版年	2003
卷号	14 期号:9 页码:1512-1516
中文摘要	研究了1999年（丰水年）和2000年（干旱年）旱地条件下不同时间覆膜（不覆膜、覆膜30d、覆膜60d和全程覆膜）对春小麦（Triticum aestivum）农田土壤微生物体碳的影响。结果表明，1999年土壤微生物体碳平均为335.3 mg·kg~(-1)干土，2000年平均为259.3 mg·kg~(-1)干土，前者高出后者29.37％。2年中最高微生物体碳均出现在全程覆膜处理。1999年，土壤微生物体碳在覆膜60d时即接处最高值，该处理籽粒产量也最高。2000年，由于春小麦生育后期降水丰富，在整个生育期中，微生物碳增长表现为增长－平稳甚至出现下降－再增长的梯形方式，到生育后期，各处理之间才出现显著差异，全程覆膜处理的微生物体碳后期大幅度增加，与1999年接近。2年中各处理的C／N处于7.732～9.042之间，远低于11.3的临界值，C／P处于300.8～719.6之间，均高于300的临界值，不利于土壤微生物体碳的增加，微生物和作物对土壤有效态氮和磷的吸收处于竞争状态，表明该农田生态系统有机制严重不足，已经构成了限制作物生产力发挥的重要因素，长期地膜覆盖和大量使用化甩将加剧这一问题的严重性。
英文摘要	This paper studied the effect of different periods of plastic film mulching (M\|,-no mulching, M10-mulching for 30 days, MjQ-mulching for 60 days, and M-mulching for whole growth period) on soil microbial biomass carbon (SMBC) of spring wheat field in semi-arid loess plateau. The mean SMBC in 1999 and 2000 was 335, 3 and 259.3 mg-kg"1 dry soil, respectively. It was 29.3% higher in 1999 than in 2000. The highest SMBC was recorded at the harvest stage in M treatment for the two years. In 1999, a wet year with more rainfall, the SM-BC of Mgo and M treatments was significantly higher than those of M<) and M3() in the mid-period of growth, reached its top at the end of the growth period. The highest grain yield was also achieved in M60. It was a dry year in 2000, but rainfall was rich in the latter growth period of spring wheat. SMBC increased at the beginning period of growth, and did not increase during the mid-growth period. It increased again during the latter period of growth, and showed a significant difference among the treatments. At the harvest stage of 2000, SMBC in Mo was the highest among all the treatments. It was similar between M and M6qi and lower than that of M30. In the two years, the ratio of C/N ranged between 7. 732 - 9.042, being lower than the threshold of 11.3, and the ratio of C/P was 300. 8 - 719. 6, being higher than the threshold of 300. The two parameters showed that the increase of SMBC was inhibited because of the competition of soil available nutrients between soil microbes and crops. These indicated that soil organic matter content was so shortage that it became the key factor to re-strict crop productivity. Under this condition, increasing crop productivity through the input of chemical fertiliz-ers would conceal the problem of soil degradation, and result in a further decrease of soil quality, A long term plastic film mulching would make the problem more serious.
中文关键词	地膜覆盖 ; 土壤微生物体碳 ; 植物营养 ; 春小麦 ; 土壤质量 ; 半干旱黄土高原
英文关键词	plastic film mulching soil microbial biomass carbon spring wheat plant nutrition soil quality semi-arid Loess Plateau
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:1259645
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/204541
作者单位	兰州大学, 干旱农业生态国家重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	宋秋华,李凤民,刘洪升,等. 黄土区地膜覆盖对麦田土壤微生物体碳的影响[J]. 兰州大学,2003,14(9):1512-1516.
APA	宋秋华,李凤民,刘洪升,王俊,&李世清.(2003).黄土区地膜覆盖对麦田土壤微生物体碳的影响.应用生态学报,14(9),1512-1516.
MLA	宋秋华,et al."黄土区地膜覆盖对麦田土壤微生物体碳的影响".应用生态学报 14.9(2003):1512-1516.