桥山林区油松人工林营养元素分配与积累的研究

摘要/Abstract

摘要： 在陕西省桥山林区3块油松人工林样地中,对油松人工林生态系统各组分中N、P、K、Ca和Mg等5种营养元素的含量、分配格局、积累规律以及它们与密度间的关系进行了研究.结果表明,油松人工林不同器官中营养元素含量排序为树叶＞树枝＞树根＞树皮＞干材;在26年生油松人工林现存量中,N、P、K、Ca、Mg总量分别为214.44、22.91、158.88、167.36和29.42kg·hm^-2;乔木层、灌木层、草本层和死地被物层养分贮量分别为498.98、3.32、7.31和83.40kg·hm^-2;油松人工林N、P、K、Ca和Mg的富集系数分别为3.98、4.28、5.69、1.08和4.01;每生产1t有机物质需要这5种元素约8.43～9.09kg·hm^-2a^-1;乔木层中营养元素积累量为288.26～606.07kg·hm^-2,其中干材营养元素积累量约占乔木层的14.1%～16.8%.

关键词: 油松, 人工林, 黄土区, 营养元素, 土壤墒度, 产量, 玉米, 光合, 滴灌

Abstract: The contents,accumulation and distribution of 5 nutrient elements (N,P,K,Ca,Mg) were studied in 3 plots of Chinese pine plantations in Qiaoshan forested region in Shaanxi Province.The results showed that the nutrient content in various orga ns was in the order of needle>branch>root>bark>stem.In the 26 year plantati on,the storage of N,P,K,Ca and Mg was 214.44,22.91,158.88,167.36 and 29.42kg·hm^-2.The total element accumulation was 498.98 kg·hm^-2 in the tree laye r,3.32kg·hm^-2 in the shrub layer,7.31kg·hm^-2 in the herb layer and 8 3.40kg·hm^-2 in dead soil covering layer.The enrichment ratios of N,P,K, Ca and Mg in Chinese pine plantation were 3.98,4.28,5 69,1.08 and 4.01.The net pr oduction of organic matter per ton needs a total five elements of 8.43～9.09kg· hm^-2·yr^-1.The total nutrient elements accumulation in tree layer wa s 288.26～606.07kg·hm^-2,of which stem accounted for 14.1～16.8%.

Key words: Pinus tabulaeformis, Plantation, Qiaoshan fo rested region, Nutrient element, photosynthesis, yield., maize, soil moisture, drip irrigation

中图分类号:

S791.254

高甲荣, 肖斌. 桥山林区油松人工林营养元素分配与积累的研究[J]. 应用生态学报, 2001, 12(5): 667-671.

GAO Jiarong, XIAO Bin. Nutrient distribution and accumulation pattern of Chinese pin e plantations in Qiaoshan forested region[J]. Chinese Journal of Applied Ecology, 2001, 12(5): 667-671.

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