CAJ | 학술논문

选择中国亚热带分布较广的树种马尾松Pinus massoniana青冈Cydobalanopsis glauca,香榧Torreya grandis'Merrillii'和山核桃Carya cathayensis,采用分解袋法对其凋落叶分解进行研究.结果表明:马尾松凋落叶分解最慢.年分解系数为0.49,香榧分解最快,年分解系数为1.70,分解速率从大到小依次为香榧、山核桃、青冈和马尾松.4种凋落叶的分解速率与初始全氮质量分数呈极显著正相关(P<0.01),与初始全磷质量分数呈显著正相关(P<0.05),凋落叶的初始氮、磷质量分数可以作为预测这4个树种在亚热带分解快慢的良好指标.分解过程中马尾松、青冈和山核桃凋落叶的氮和磷均有不同程度的富集现象.青冈和香榧的钾质量分数在前2个月就分别从6.22和11.16g·kg~(-1)下降到1.96和2.05g·kg~(-1),之后趋于稳定,马尾松则表现为先下降后升高.
선택중국아열대분포교엄적수충마미송Pinus massoniana청강Cydobalanopsis glauca,향비Torreya grandis'Merrillii'화산핵도Carya cathayensis,채용분해대법대기조락협분해진행연구.결과표명:마미송조락협분해최만.년분해계수위0.49,향비분해최쾌,년분해계수위1.70,분해속솔종대도소의차위향비、산핵도、청강화마미송.4충조락협적분해속솔여초시전담질량분수정겁현저정상관(P<0.01),여초시전린질량분수정현저정상관(P<0.05),조락협적초시담、린질량분수가이작위예측저4개수충재아열대분해쾌만적량호지표.분해과정중마미송、청강화산핵도조락협적담화린균유불동정도적부집현상.청강화향비적갑질량분수재전2개월취분별종6.22화11.16g·kg~(-1)하강도1.96화2.05g·kg~(-1),지후추우은정,마미송칙표현위선하강후승고.
In order to know its material cycling in the forest ecosystem for better sustainable management,leaf litter of four tree species(Pinus massoniana,Cyclobalanopsis glauca,Torreya grandis,and Carya cathayensis)from subtropical China was studied in a decomposition experiment with nylon bag using a correlation analysis.Leaf litter were collected in Chun'an County of Zhejiang Province,in March of 2006,drying at 80℃ to constant weight,packed with 144 nylon bags,then replaced to evergreen broad-leaf forest's ground surface.Twelve bags were withdrawn once a month.Then determine weight loss rate,and N,P,K,C and lignin contents variation.Results showed that the decomposition rate of T.grandis was fastest,annual decomposition coefficient(k)is 1.70,whereas the slowest was P.massoniana,k=0.49.The correlation analysis was significant for litter decomposition rate and both initial N concentration(r=0.99,P<0.01)and initial P concentration(r=0.97,P<0.05).During litter decomposition,N and P concentrations in leaf litter of Carya cathayensis,P.massoniana,and Cyclobalanopsis glauca increased.Also,rapid decreases were found in the first two months with K concentrations of Cyclobalanopsis glauca(6.22-1.96g·kg~(-1))and T.grandis(11.16-2.05g·kg~(-1));then they decrease slowly.However,P.massoniana decreased(0.88-0.54g·kg~(-1))in the beginning then increased(0.54-1.90g·kg~(-1)).Thus,initial N and P leaf litter concentrations were sensitive indicators for decomposition rates in subtropical China.