间作对作物产量效应的Meta分析

旨在探明间作模式对作物产量的影响,为间作措施的合理应用和推广提供理论依据。该研究以单作为对照,利用Meta分析方法定量分析间作对作物产量的影响及其影响因素。结果表明,间作较单作显著降低了作物产量,尤其在温带地区。此外,在地面覆盖和豆科作物条件下,间作也降低了作物产量。然而,当降雨量超过600 mm时,间作较单作的作物产量显著增加了29.6%。而当降雨量小于600 mm时,间作较单作的作物产量降低了18.7%。年均气温也显著影响间作的产量效应,当年均气温高于20℃时,间作较单作的作物产量降低了55.1%,长期间作（>5年）有利于提高产量,然而当年数少于3年时,间作较单作却降低了作物产量。高有机质含量(>20 g/kg)和低有机质含量(1 g/kg)条件下,间作均不利于作物产量提高。与此类似,当土壤全氮高于1.5 g/kg时,间作较单作的作物产量降低48.6%。间作对作物产量的降低幅度在pH 6.5~7.5时是最大的。当土壤有效磷、氮和钾含量分别为>30 mg/kg、 <50 mg/kg和50~100 mg/kg时间作较单作降低作物产量。因此,间作的产量效应受气候、试验年限和土壤性状等多种因素的影响。

Meta-analysis: The Effect of Intercropping on Crop Yield

The aim of this study is to clarify the impact of intercropping on crop yield, and to provide a theoretical basis for the rational application and promotion of intercropping measures. This study used a single cropping as a control to quantify and analyze the effects of intercropping on crop yield and the influencing factors. The results showed that, compared with single cropping, intercropping significantly reduced crop yields, especially in temperate regions. In addition, intercropping also reduced crop yields under ground cover and legume conditions. However, when rainfall exceeded 600 mm, crop yield of intercropping significantly increased by 29.6%, compared with single cropping. When rainfall was less than 600 mm, crop yield of intercropping decreased by 18.7%. The average annual temperature also significantly affected the yield effect of intercropping. When the annual average temperature was higher than 20℃, the crop yield of intercropping was reduced by 55.1%, compared with single cropping. Long-term intercropping (>5 years) was conducive to yield increase, but when the number of years was less than 3 years, crop yield of intercropping decreased compared with single crop. Under high organic matter content (>20 g/kg) and low organic matter content (<1 g/kg), intercropping was not conducive to crop yield increase. Similarly, when the total nitrogen in soil was higher than 1.5 g/kg, crop yield of intercropping was reduced by 48.6%. The yield reduction of intercropping was the greatest at pH 6.5-7.5. When the available phosphorus, nitrogen, and potassium contents in soil were >30 mg/kg, <50 mg/kg, and 50-100 mg/kg, respectively, intercropping reduced crop yield compared with single cropping. Therefore, the yield effect of intercropping is affected by various factors such as climate, test years and soil properties.