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《Acta Pedologica Sinica》 2004-01
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Pang Xueyong 1Liu Shiquan 2Liu Qing 1 Lin Bo 1Wu Yan 1He Hai 1,3 Bao Weikai 1 (1 Chendu Institute of Biology,Chinese Academy of Sciences,Chendu610041,Chi na) (2 Sichuan Agricultural University,Yaan,Sichuan625014,China) (3 Department of Biology,Chongqing Normal University,Chongqing400047,China)  
Subalpine coniferous forest in western Sichuan is an important part of Sichuan forests Because it mainly distributes in Jinshajiang River of upper r e aches of the Yangtze River and its branches,Yalongjiang and Minjiang River and so on,it takes very important role in water conservation and soil protection i n these area Moreover,it also has a tremendous influence on economy and balan ce of ecosystem in this region and also as far as to the middle and lower reaches of the Yangtze River Since 1940 s,natural coniferous forest was felt in grand s cale,then spruce forests were planted on clear felled areas in succession At p resent,there are 4 3×10 4 hm 2 spruce plantation in these regions But sim ple st ructure of artificial plant community had led to the degradation of forest ecosy stem function The soil organic matter and nutrient pool were studied under sub a lpine spruce plantation in western Sichuan The results indicated that the soil organic matter and nutrient pool under spruce plantation degradated greatly De c ay rate and recycling period of spruce plantation were slower than those of seco ndary broad forest and natural coniferous forest,which led to that dry matter o f forest floor and nutrients stored in the litter layer can't enter soil Soil O M content,total N,total P and alkali hydrolyzable N abruptly decreased with in creasing of forest ages The unitary composition of spruce plantation with less litter and nutrient returned to soil and the slower decay rate of litter were cr ucial factors inducing the degradation of the soil organic matter and nutrient p ool in this area In addition,human induced disturbance,especially clearin gout of litters and shrubs under plantation were another factor of the degradat ion of the soil organic matter and nutrient pool It was suggested that the deg radation of the soil organic matter and nutrient pool could be controlled by pla nting coniferous hardwood and the rational thinning down after spruce plantati on matured
【Fund】: 国家重点基础研究发展规划项目专题(G2 0 0 0 0 4 6 80 2 - 0 5:G1 9980 4 81 4);; 中国科学院知识创新工程重大项目(KSCX1 - 0 7- 0 2 );; “十五”国家重大科技攻关项目课题(2 0 0 1BA6 0 6A - 0 5);; “西部之光”人才计划项目资助
【CateGory Index】: S718
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