Zhang Min, Zou Xiao-Ming
Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China.
Ying Yong Sheng Tai Xue Bao. 2009 May;20(5):1013-9.
With the rubber plantation and seasonal rain forest in Xishuangbanna of Southwestern China as test objectives, a comparative study was conducted on their litter input, soil total C and N contents, and seasonal changes of soil active C and N from 2006 to 2007. Comparing with seasonal rain forest, rubber plantation had lower amount of aboveground litterfall and higher amount of floor mass, reflecting the lower decomposition rate (turnover coefficient, K) of litters, and had higher C/N ratio of litters and soil, indicating that the organic matters in rubber plantation were more resistant to degradation. The surface soil total organic C, labile organic C, and microbial biomass C concentrations in rubber plantation accounted for 60%-70% of those in seasonal rain forest, and the soil NO3(-)-N concentration and pH value in rubber plantation were lower than those in seasonal rain forest, indicating that the conversion from seasonal rain forest to rubber plantation decreased the C and N inputs from aboveground litterfall and the availability of soil C and N, and caused soil acidification. Moderate land management strategies for rubber plantations were needed to prevent the degradation of soil quality and to maintain the productive sustainability.
以中国西南部西双版纳的橡胶种植园和季节性雨林为研究对象，于2006年至2007年对其凋落物输入量、土壤总碳和氮含量以及土壤活性碳和氮的季节变化进行了比较研究。与季节性雨林相比，橡胶种植园的地上凋落物量较低，地表凋落物量较高，这反映出凋落物的分解速率（周转系数，K）较低，且凋落物和土壤的碳氮比更高，表明橡胶种植园中的有机物更难降解。橡胶种植园中表层土壤的总有机碳、活性有机碳和微生物生物量碳浓度占季节性雨林的60%-70%，橡胶种植园的土壤硝态氮浓度和pH值低于季节性雨林，这表明从季节性雨林转变为橡胶种植园减少了地上凋落物的碳氮输入以及土壤碳氮的有效性，并导致了土壤酸化。需要采取适度的橡胶种植园土地管理策略，以防止土壤质量退化并维持生产的可持续性。
