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东北地区有大量的农林间作系统,了解其土壤水分和养分的分布特征对于农林间作系统的持续经营和生产力的提高具有重要意义。本研究以辽宁省付家机械林场的杨树-玉米间作系统为对象,以玉米单作系统为对照,对玉米收获后的土壤水分和养分分布特征进行了调查。结果表明:杨树-玉米间作显著降低了0~100 cm各层土壤含水率,提高了10~100 cm土层土壤无机氮含量和0~50 cm土层土壤有机氮含量,增加了土壤有机碳、全磷含量在0~30与30~100 cm土层分布的差异。间作改变了土壤水分、养分元素之间的相关关系。在玉米单作系统中,土壤有机氮、有机碳、全磷含量与土壤含水率、土壤无机氮含量均存在显著的相关性,而在间作系统中土壤含水率和无机氮含量与土壤有机氮、有机碳、全磷含量相关性较弱。本研究可为辽北地区农林间作系统土壤水分和养分的管理提供科学依据,并为进一步探讨该地区间作系统土壤养分循环奠定基础。
Northeast China has a large number of agroforestry systems and understanding its distribution of soil moisture and nutrients is of great importance to the sustainable management of agroforestry systems and the improvement of productivity. In this study, poplar-maize intercropping system in Fujia mechanical forest farm of Liaoning Province was taken as an object. Corn monocrop system was used as a control to investigate the characteristics of soil moisture and nutrient distribution after maize harvest. The results showed that the poplar-corn intercropping significantly reduced the soil water content of 0 ~ 100 cm layers, increased soil inorganic nitrogen content and soil organic nitrogen content in 0 ~ 50 cm soil layer in 10 ~ 100 cm soil layer, increased soil organic carbon , Total phosphorus content in 0 ~ 30 and 30 ~ 100 cm soil layer distribution differences. Intercropping changes the relationship between soil moisture and nutrient elements. In corn single cropping system, there was a significant correlation between soil organic nitrogen, total organic carbon and total phosphorus and soil moisture and soil inorganic nitrogen content. However, in the intercropping system, soil moisture content and inorganic nitrogen content were positively correlated with soil organic nitrogen, Organic carbon, total phosphorus content of the correlation is weak. This study can provide a scientific basis for management of soil moisture and nutrients in the inter-cropping system in northern Liaoning, and lay the foundation for further discussion of the soil nutrient cycling in the inter-cropping system.