EFFECT OF LONG-TERM FERTILIZATION, STUBBLE MULCH AND IRRIGATION UNDER DIFFERENT FERTILIZATION ON SOIL ENZYME AND SOIL NUTRIENTS
On the basis of the 28-year experiment located in Heyang County, Shaanxi Province, effects of fertilization, stubble mulch and irrigation under different fertilization on soil urease, phosphatase, invertase, hydrogen peroxidase activities and contents of soil nutrients were studied through principal component analysis and cluster analysis. Results were as follows： the activities of Urease was not influenced by NP treatment, the activities of phosphatase and invertase increased 119.6% and 22.0% by NP treatment respectively. The activities of urease, phosphatase and invertase increased 53.2% ,130.8% and 60.6% by NPM treatment, respectively, thus effects of NPM on enzyme activities were obviously higher than that of NP. Effects of stubble mulch and irrigation on urease, phosphatase and invertase activity were different due to different fertilization. The contents of alkaline nitrogen, available phosphorus and total nitrogen were increased by NP and the contents of soil organic matter, alkaline nitrogen and available phosphorus were increased by irrigation under NP treatment. The contents of soil organic matter, alkaline nitrogen, available phosphorus, available potassium, total nitrogen and total phosphorus were increased by NPM and stubble mulch treatment. In addition, the content of available phosphorus in NPM treatment was 64.4mg/kg higher than that in control, which was 44.0 mg/kg higher in NMP combined with stubble mulch treatment than NPM treatment. Fertilization, stubble mulch and irrigation had no obvious influence on the content of total potassium and hydrogen peroxidase activity in soil. Principal component analysis and clustering analysis showed that nutrient factor and enzyme activity factor of soil were easily increased by NPM and NPM combined irrigation, stubble mulch was helpful to increase soil nutrient factor, but not to increase enzyme activity factors, and irrigation was not so effective as fertilization or stubble mulch. It is necessary to pay attention to the negative effect of stubble mulch on enzyme activities.
国家科技期刊平台
NSTL
万方数据
维普
