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黄土高原半干旱地区刺槐人工林密度与地上生物量效应
引用本文:王百田,王颖,郭江红,郑培龙,马丰斌,张华.黄土高原半干旱地区刺槐人工林密度与地上生物量效应[J].中国水土保持科学,2005,3(3):35-39.
作者姓名:王百田  王颖  郭江红  郑培龙  马丰斌  张华
作者单位:北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点实验室,100083,北京
基金项目:国家自然科学基金项目“干旱半干旱地区植被恢复基础研究”(3007063);“十五”国家科技攻关项目“退耕还林工程区干旱阳坡防护林营造技术研究”(2001BA51080304)
摘    要: 以黄土高原半干旱地区的山西省方山县人工刺槐林为对象,采用树干解析与称重法,设立标准地对10个不同密度人工刺槐林进行了生长与生物量调查,分析密度对单木和林分生物量的效应。结果表明:18年刺槐林分的地上现存生物量与测树指标D2H和D有很好的相关性,其中树干和叶的生物量与D2H关系密切,而枝条生物量与D关系密切。刺槐单木总生物量及各部分生物量都是密度的幂函数,但是对林分而言,低密度林分和高密度林分的总生物量都比较高,而处于中间密度林分的生物量较低;林分现存总生物量也呈同一趋势。从总生物量来说,林分的水分利用效率与密度不存在线性关系,但是其干材的水分生产效率是随着密度降低而增加的,反映出不同密度水分利用效率的经济价值不同。

关 键 词:刺槐  林分密度  人工林  生物量  黄土高原
收稿时间:2005-02-22
修稿时间:2005-04-12

Effect on biomass of stand density of artificial Black Locust forest in semi-arid region of Loess Plateau
Wang Baitian,Wang Ying,Guo Jianghong,Zheng Peilong,Ma Fengbin,Zhang Hua.Effect on biomass of stand density of artificial Black Locust forest in semi-arid region of Loess Plateau[J].Science of Soil and Water Conservation,2005,3(3):35-39.
Authors:Wang Baitian  Wang Ying  Guo Jianghong  Zheng Peilong  Ma Fengbin  Zhang Hua
Institution:College of Soil and Water Conservation, Beijing Forestry University, Key Laboratory of Soil and Water Conservation and Combating desertification,
Ministry of Education, 100083, Beijing, China
Abstract:Stand volume increment and biomass were respectively investigated by using stem analysis and weighing at 10 permanent sample plots of 18-year artificial black locust(Robinia Pseudoacacia)forest in semi-arid region of Loess Plateau, and the relation between biomass and stand density was analyzed. The results show that there is a good correlation between D2H and stem biomass and leaves biomass while same between D and branch biomass in forest inventory factors, and a closely power function relation of stand density to total biomass, branches biomass, leaves and fructification biomass of individual tree. Meanwhile it is true that there is not significant correlation between total stand biomass and stand density. Stand biomass is higher in lower and higher density than in medium density ranging between 833hm2 and 5000hm2 stand density, moreover higher stem biomass can be obtained to stand density less than 1111hm2. Individual tree biomass of 5000hm2 and 833hm2 stand density is respectively 9.19kg and 56.31kg, while its stand biomass is respectively 45950kg/hm2 and 46906kg/hm2, not significant different. Furthermore, water production efficiency (WPE) of present biomass was analyzed. Annual average rainfall is 487mm for 1986—2003 at the region, WPE of 5000hm2 and 833hm2 stand is respectively 0.5546 and 0.5663, while that of stem biomass is respectively 0.2758 and 0.3965. Obviously, biomass of lower density stands has higher proportion of economic value though higher density stands also harvest more biomass.
Keywords:Black Locust  stand density  artificial forest  biomass  Loess Plateau
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