Soil Nutrient Characteristics of Different Cunninghamia lanceolata Stand Types and Relationships with Litter Nutrients
In order to investigate effects of Cunninghamia lanceolata mixed plantations on soil nutrients,taking C.lanceolata pure plantation,mixed plantation of C.lanceolata and Mytilaria laosensis and mixed plantation of C.lanceolata and Michelia macclurei as research objects,soils in 0-20 and 20-40 cm soil layers were collect-ed,and litters were collected and classified.Physical properties of soils,contents of nitrogen,phosphorus,potas-sium and their available components,organic carbon,calcium and magnesium in soils and litters were deter-mined.Correlation analysis and redundancy analysis were used to analyze changes of soil nutrient contents in different C.lanceolata stand types and effects of litter nutrient contents on soil nutrient contents.Results showed that pH value,bulk density,water content and contents of organic carbon,total nitrogen,alkali-hydro-lyzable nitrogen,total potassium,available potassium and calcium in soils were significantly affected by stand type,and soil nutrient contents(except for total potassium and available potassium)in mixed plantations were higher than those in pure plantation.In the same stand type,nutrient contents in 0-20 cm soil layer were higher than those in 20-40 cm soil layer,all of which reached significant or extremely significant differences.Results of correlation analysis on soil nutrient contents showed that there were effects among soil nutrients.Litter nutri-ent contents in different stand types were different.Results of redundancy analysis showed that soil nutrient content was significantly affected by content of magnesium in litter of broad leaves and content of total potassi-um in litter of needle leaves in 0-20 cm soil layer.Soil nutrient content was significantly affected by contents of magnesium in litters of broad leaves and others in 20-40 cm soil layer.Mixture of C.lanceolata and broad-leaved tree species showed positive effects on accumulations of soil nutrients.Stand type affected litter nutrients and affected soil nutrient contents by changing contents of magnesium and potassium in litters.
国家科技期刊平台
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