Wang Qing-Kui, Fan Bing, Xu Guang-Biao
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
Ying Yong Sheng Tai Xue Bao. 2009 Jul;20(7):1536-42.
A comparative study was made on the soil active organic matter in a broadleaved forest and two Chinese fir (Cunninghamia lanceolata) plantations in subtropical region of China, aimed to understand the effects of forest conversion and continuous plantation on soil organic C and nutrient status. After the conversion from broadleaved forest to Chinese fir plantation, the contents of soil total organic C, humus C, humic acid, and fulvic acid decreased by 27.8%-52.1%, 32.2%-52.8%, 36.4%-59.0%, and 29.7%-50.0%, respectively. Continuous plantation also resulted in the decrease of soil organic C and humus contents. The contents of soil total organic C, humus C, humic acid, and fulvic acid in second generation of Chinese fir plantation were 9.0%-25.0%, 25.0%-38.0%, 28.6%-39.2% and 23.1%-36.4% lower than those in the first generation of Chinese fir plantation, respectively. More obvious effects were observed on the soil active organic matter. After the conversion from broadleaved forest to Chinese fir plantation, the maximum decrement of soil microbial biomass C and N and dissolved organic C and N was 61.8%, 38.2%, 43.3%, and 69.0%; while comparing with the first generation of Chinese fir plantation, the second generation of Chinese fir plantation had the maximum decrement of soil microbial biomass C and N and dissolved organic C and N being 34.7%, 29.3%, 30.4%, and 18.4%, respectively. Soil nutrient contents also decreased due to forest conversion and continuous plantation. In comparing with broadleaved forests, Chinese fir plantations had a decrease of soil N, P, and K contents being 15.7%-31.2%, 11.5%-49.3%, and 15.1%-33.8%, respectively. There were close relationships between soil nutrients and soil active organic matter fractions except cold water extractable organic N.
对中国亚热带地区的一片阔叶林和两片杉木（Cunninghamia lanceolata）人工林的土壤活性有机质进行了比较研究，旨在了解森林转变和连栽对土壤有机碳和养分状况的影响。从阔叶林转变为杉木人工林后，土壤总有机碳、腐殖质碳、腐殖酸和富里酸含量分别下降了27.8%-52.1%、32.2%-52.8%、36.4%-59.0%和29.7%-50.0%。连栽也导致土壤有机碳和腐殖质含量下降。第二代杉木人工林的土壤总有机碳、腐殖质碳、腐殖酸和富里酸含量分别比第一代杉木人工林低9.0%-25.0%、25.0%-38.0%、28.6%-39.2%和23.1%-36.4%。对土壤活性有机质的影响更为明显。从阔叶林转变为杉木人工林后，土壤微生物生物量碳和氮以及溶解性有机碳和氮的最大降幅分别为61.8%、38.2%、43.3%和69.0%；而与第一代杉木人工林相比，第二代杉木人工林土壤微生物生物量碳和氮以及溶解性有机碳和氮的最大降幅分别为34.7%、29.3%、30.4%和18.4%。森林转变和连栽还导致土壤养分含量下降。与阔叶林相比，杉木人工林的土壤氮、磷和钾含量分别下降了15.7%-31.2%、11.5%-49.3%和15.1%-33.8%。除冷水可提取有机氮外，土壤养分与土壤活性有机质组分之间存在密切关系。
