摘要
采用单因素随机区组试验研究了果-草人工生态系统中牧草的不同利用方式对土壤理化及生物学性状的影响。结果表明:刈割覆盖、刈割压埋、畜肥还园3种利用方式均能较清耕提高土壤水分含量,降低土壤密度,稳恒土壤温度,提高土壤养分含量,增加土壤微生物数量,提高土壤酶活性。相关性分析发现,除全P与纤维分解菌、纤维分解酶、多酚氧化酶为负相关外,其余养分与生物因子间均呈正相关,且多数养分与生物因子呈显著或极显著相关;经通径分析发现,脲酶、硅酸盐细菌、纤维分解酶是促进有机质积存的主要生物因素,蔗糖酶是影响N、P、K速效养分的最主要因子,过氧化氢酶、多酚氧化酶、纤维分解菌只是选择性地对有机质的积存和N、P、K速效养分的形成起作用。
A single factor experiment with randomized plot arrangement was carried out to study effects of utilization pattern of pasture on soil physical, chemical and biological properties in an artificial fruit-grass ecosystem. Results showed that compared with cleaning tillage, the other three treatments, such as mowing and mulching, mowing and burying and applying livestock manure to the orchard, raised soil water content, decreased soil density, stabilized soil temperature, increased soil nutrient content, population of soil micro-organisms, and activity of soil enzymes. A conclusion was reached after a correlation analysis that soil nutrients were positively related to biological factors, except total P, which was negatively correlated with cellulose-decomposing bacteria, cellulolytic enzyme, and polyphenol oxidase. The relationship between them was significant or extremely significant. A pathway analysis revealed that urease, silicate bacterium and cellulolytic enzyme were the main biological factors contributing to accumulation of organic matter; sucrase was the most important factor affecting readily available nutrients of N, P and K; and catalase, polyphenol oxidase, cellulose-decomposing bacteria only selectively affected accumulation of organic matter and formation of readily available nutrients of N, P and K.
出处
《土壤》
CAS
CSCD
北大核心
2007年第5期806-812,共7页
Soils
关键词
果-草人工生态系统
土壤
理化生性状
相关性分析
通径分析
Artificial fruit-grass ecosystem, Soil, Physical-chemical-biological properties, Correlation analysis, Pathway analysis
