两种测算香樟单株植物生物量和生产力的方法.docx

两种测算香樟单株植物生物量和生产力的方法*＊＊高凯胡永红冷寒冰孟超秦俊( 上海植物园，上海城市植物资源开发应用工程技术研究中心，上海 200231)摘 要 利用经典收获法是测算森林生物量和生产力最为普遍的手段，但由于城市结构复 杂和高异质性，使得这种方法并不适合在该区域使用。因此，本文选择上海绿地中应用最 广泛的香樟植物为代表，以非破坏方式，利用叶片光合固碳测算的气体交换法来构建表观 特征和生物量、生产力模型，同时，该模型以经典收获法为基准进行验证对比。结果表明: 以经典收获法为准，上海香樟单株植物年均净生产力是其地上部分生物量的 23% ±4% ，地上生物量 AVB = 1． 37D2． 15( D 为冠幅，Ｒ2 = 0． 97，P ＜0． 01 ) ，地上净生产力 ANPP = 0． 32D2． 13( D 为冠幅，Ｒ2 = 0． 97，P＜0． 01) ，气体交换法与经典收获法相比验证准确率达 87． 3% 。系统和环境误差是导致两个模型差异的主要原因，如附加相关修正系数后，该模型将可应用于城镇高精度遥感监测和碳汇能力的快速自动化提取估算，并减少建模的破坏性。关键词 香樟; 生物量; 生产力; 砍伐; 光合速率中图分类号 Q948. 1 文献标识码 A 文章编号 1000 －4890( 2014) 1 －0242 －07Two methods of estimating biomass and productivity for Cinnamonum camphora at indi- vidual scale． GAO Kai，HU Yong-hong，LENG Han-bing，MENG Chao，QIN Jun＊＊ ( Shang- hai Botanical Garden，Shanghai Engineering Ｒesearch Center of Sustainable Plant Innovation， Shanghai，200231，China) ． Chinese Journal of Ecology，2014，33( 1) : 242 －248．Abstract: The classic harvest method is most reliable to estimate forest biomass and net primaryproductivity ( NPP) but not suitable in an urban green area due to its high heterogeneity． There- fore，a non-destructive method based on gas exchange measurements for estimating photosynthetic carbon sequestration was used to establish apparent characteristics and biomass and NPP modelsfor Cinnamomum camphora，which is the most abundant greening species in Shanghai． The re-sults showed that annual net primary productivity ( ANPP) of individual trees based on the har- vest method was 23% ±4% of aboveground biomass ( AVB) ，AVB = 1． 37D2． 15 ( D: Crown，Ｒ2 = 0. 97，P＜0． 01) ，ANPP = 0． 32D2． 13( D: Crown，Ｒ2 = 0． 97，P＜0． 01) ． The estimated biomass or ANPP based on the gas exchange method was tightly colse to that based on the harvest methodwith an accuracy rate of 87． 3% ． The system and environmental errors were the main sources ofthe difference between the two methods． When tuning the relevant correction factors，the gas ex- chan