间伐对杉木人工林叶片与土壤氮磷耦合关系的影响  

Effects of Thinning on Leaf-soil Nitrogen and Phosphorus Coupling Relationships in Chinese Fir Plantation

作　　者：周昌和 余国民 罗旭辉 蔡超 俞飞[2] Zhou Changhe;Yu Guomin;Luo Xuhui;Cai Chao;Yu Fei(Longquan Forestry Bureau of Zhejiang Province,Longquan 323700,P.R.China;Zhejiang A&F University)

机构地区：[1]浙江省龙泉市林业局,龙泉323700 [2]浙江农林大学

出　　处：《东北林业大学学报》2023年第11期125-130,共6页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(31971623);龙泉市林业局项目。

摘　　要：为研究60%强度间伐后杉木(Cunninghamia lanceolata)人工林叶片与土壤养分耦合关系,以间伐后5 a和未间伐(对照)杉木人工林为研究对象,分析叶片和0<土层深度(d)≤60 cm土壤氮、磷化学计量特征及叶片与土壤氮磷的耦合关系。结果表明:间伐显著降低了0<d≤60 cm土层全氮、全磷质量分数;对照土壤碱解氮质量分数下降主要发生在10 cm<d≤20 cm、40 cm<d≤60 cm土层,而间伐杉木林土壤碱解氮质量分数降低主要发生在10 cm<d≤20 cm土层;对照土壤速效磷质量分数在40 cm<d≤60 cm土层最高,而间伐在0<d≤10 cm土层最高。间伐后,杉木叶片全氮和全磷质量分数显著降低,但其比值是对照的2.3倍。对照中,叶片全氮和土壤碱解氮质量分数、叶片全磷和土壤速效磷质量分数、叶片全氮与全磷质量分数比和土壤碱解氮与速效磷质量分数比均显著正相关,间伐后相关性均不显著。可见,高强度间伐在短期内降低了杉木人工林土壤全氮和全磷质量分数,改变了土壤碱解氮和速效磷质量分数随土层深度变化的趋势,并使叶片与土壤氮、磷化学计量特征呈解耦合关系。In order to reveal the effects of thinning with 60%intensity on leaf-soil nutrient coupling relationships in Chinese fir plantation,we examined the nitrogen(N),phosphorus(P)stoichiometry in leaves and soils of 0-60 cm for the Chinese fir plantation in 5 years after thinning and non-thinning(control).The total N and total P contents in 0-60 cm soil layers were significantly decreased in the thinning treatment.The available N content of control treatment decreased significantly in the 10-20 and 40-60 cm soil layers,and the available N content of thinning treatment decreased with increasing soil depth mainly in the 10-20 cm soil layer.The available P of control treatment was the highest in 40-60 cm soil layer,while that of thinning was the highest in 0-10 cm soil layer.After thinning,the total N and P contents of Chinese fir leaves were 82%and 35%of those of the control,respectively,but the N∶P was 2.3 times of that of the control.In the control treatment,total N,total P and their ratio of Chinese fir leaves were positively correlated with soil available N,available P and the ratio,respectively,but these correlations were not significant after thinning.Therefore,high intensity thinning reduced soil total N and total P contents in Chinese fir plantation in a short term,changed the trend of soil available N and available P concentration with soil depth,and uncoupled the leaf with soil N and P stoichiometry.

关 键 词：氮磷化学计量特征 养分耦合关系 间伐 杉木 土壤 

分 类 号：S753.3[农业科学—森林经理学] S714[农业科学—林学]