天然林转换为竹林对土壤碳氮含量及物理性质的影响

Study on Soil Carbon,Nitrogen and Physical Properties of Natural Forest(Castanopsis Carlesii)and Bamboo Plantation

选择闽南安溪云中山山区由天然林转换的竹林及其前身丝栗栲天然林为研究对象,对其土壤碳氮含量及物理性质进行对比研究,结果表明:丝栗栲天然林和竹林林下土壤容重随土层深度的增加而增加,土壤最大持水量、有机碳和全氮含量随土层深度增加迅速下降;与丝栗栲林下土壤相比,竹林林下土壤表层(0-20cm)容重、最大持水量和有机碳含量分别高0.18g·cm-3、低12.08%和低11.80g·kg-1,这可能是森林转换的结果,但竹林林下土壤60-100cm土层有机碳含量和40-60cm土层全N含量均显著高于丝栗栲林下相应土层,与表层的对比结果相反.天然林转换成竹林后,有机碳含量和全N降低了45.23%和10.0%.

Soil carbon and nitrogen concentrations and physical properties of natural forest （Castan- opsis carlesii ） and bamboo plantation were studied in Yun Zhong Mountain of An＇Xi of Southern of Fu-Jian Provence,China. The results showed that： soil bulk density of two forests decrease with the growth of depth,surface （0-20 cm） soil bulk density of Castanopsis carlesii forest is 0.18 g .cm-3higher than bamboo plantation; maximum water holding capacity and carbon concentration of Castanopsis carlesii forest were 12.08% and 11.80 g .kg-1 lower than those of bamboo plantation. Organic carbon in Surface soil of Castanopsis carlesii forest is 26.09 g· kg-1 , and of bamboo plantation is 14.29 g· kg-1. After Castanopsis carlesii forest change to bamboo plantation, The organic carbon concentrations decreased by 45.23% ,and the total N content decreased by 10.0%.