基于典范对应分析PPC生物降解膜覆盖条件下土壤温度、相对含水量的综合分析

Comprehensive Evaluation with Canonical Correspondence Analysis Method on the Soil Temperature and Relative Water Content under PPC Biodegradable Film Mulch

为探讨PPC黑色、白色全生物降解膜与普通黑、白地膜不同类型地膜覆盖对旱地花生田土壤水分和温度变化动态的影响,以露地栽培为对照,测定了不同类型地膜覆盖垄作花生各生育时期耕层土壤温度和土壤相对含水量(0~15 cm)变化情况.结果 表明:全监测期内,PPC白色全降解膜地表(0 cm土层)和5 cm土层平均温度分别比对照提高1.24℃和0.62℃,15 cm处地温差异较小.覆盖地膜对0 cm土层土壤温度日平均变幅影响最大,最大变幅达7℃.覆膜处理相同土层土壤相对含水量均比对照有所增加,土层越深,相对含水量越高.基于典范对应分析法对土壤温度和相对含水量进行综合评价,结果显示,不同处理在14:00点时对土壤温度和相对含水量的影响均较大.

In order to study the effects of PPC biodegradable black and white plastic mulching on soil moisture and temperature variation dynamics in dryland crop peanut field compared with common black and white plastic mulching, variation of soil temperature and relative soil water content (0~15 cm) in ridge cultivation peanut under different coverage modes were measured at different growth stages. The results showed that the average temperature of PPC white biodegradable film on the surface(0 cm soil layer)was 1.24℃ higher than that of the control during the whole monitoring period. 5 cm soil layer was 0.62℃ higher than that of the control, and the difference of ground temperature at 15 cm was small. Covering plastic film had the greatest influence on the daily average variation of soil temperature in 0 cm soil layer, and the maximum variation was 7℃. The average relative moisture content of the same soil layer under different mulching treatments was higher than that of the control treatment. The deeper as the soil layer was, the higher that the relative water content was. Based on the canonical correspondence analysis method, the soil temperature and relative water content were comprehensively evaluated. The results showed that different treatments had greater effects on soil temperature and relative water content at 14:00.