基于Meta-analysis研究中国北方苜蓿土壤水分和养分效应

以中国北方为研究区域,检索已发表的相关文献田间试验数据,采用整合分析方法(Meta-analysis)系统探究种植年限对苜蓿地土壤水分和养分的时空效应.结果表明,与1～2龄苜蓿相比,随种植年限延长,土壤含水量和速效磷含量显著降低(P＜0.05),变化率在-38.0％～-24.0％和-46.5％～-20.2％之间,土壤有...

Effect of Soil Moisture and Nutrients on Alfalfa in Northern China Based on Meta-analysis

The purpose of this research was to systematically explore the spatiotemporal effects of planting years on soil moisture and nutrient in alfalfa field by using meta-analysis method,based on the published field experiment data and literature retrieval in northern China.The results showed that compared with 1~2 year old stands,soil moisture and available phosphorus content decreased significantly(P<0.05)with the increase of planting years,and the change rates were-38.0%~-24.0%and-46.5%~-20.2%,respectively.The soil organic matter and total nitrogen content increased first and then decreased,and the change rates were 7.2%~32.0%and-7.7%~15.7%,respectively.Precipitation had a strongly influence on soil moisture and nutrient in alfalfa field,compared with the arid and semi-arid area,planting alfalfa in the semi-humid area had the best effect on carbon and nitrogen fixation.The growth rate of soil organic matter content of 9~11 years old stands was as high as 43.1%(P<0.05),and the growth rate of total nitrogen content of 6~8 years old stands was as high as 12.5%(P<0.05),and it also strongly consumed soil water and available phosphorus.Compared with loessial soil,haplic kastanzens and sierozem,alfalfa planted in dark loessial soil for more than 15 years could significantly increase soil organic matter and total nitrogen content,with growth rates of 19.9%and 14.8%(P<0.05),respectively.Therefore,this study provides a strategy for farmers to determine the optimal growth period and improve the sustainability of the tillage system of precipitation and soil types.