杉木林分冠层光环境模拟与生物量估算  

Light environment simulation and biomass estimation of Cunninghamia lanceolata stand canopy

作　　者：谯鹏 唐丽玉[1,2] 黄洪宇[1,2] 姜泽 QIAO Peng;TANG Liyu;HUANG Hongyu;JIANG Ze(Key Laboratory of Spatial Data Mining and Information Sharing of Ministry of Education,Fuzhou University,Fuzhou 350108,Fujian,China;National Engineering Research Center of Geospatial Information Technology,Fuzhou University,Fuzhou 350108,Fujian,China)

机构地区：[1]福州大学空间数据挖掘与信息共享教育部重点实验室,福建福州350108 [2]福州大学地理空间信息技术国家地方联合工程研究中心,福建福州350108

出　　处：《中南林业科技大学学报》2023年第7期141-148,158,共9页Journal of Central South University of Forestry & Technology

基　　金：国家自然科学基金项目(41971344)。

摘　　要：【目的】探究不同密度模式下的杉木林光截获情况,进而估算林分生物累积量,为杉木人工林设计与经营管理提供科学参考。【方法】利用植物建模与虚拟地理环境技术构建三维林分场景,以林分密度为参数设计不同的林分模式,利用天文算法与辐射度模型模拟计算各林分空间下的光合有效辐射与阴影面积以评价林分荫蔽性,然后根据非直角双曲线光合模型估算林分平均净光合速率,并换算为生物累积量以评估各林分模式的生产潜力。【结果】(1)各密度林分的光截获量均随光照强度增大而升高,1.5 m×1.5 m、2.0 m×2.0 m以及2.5 m×2.5 m林分模式下的最大值分别为1577.52、1568.68与1546.08μmol·m^(-2)·s^(-1);(2)2.5 m×2.5 m林分模式下的各时刻的阳生叶面积占比最大,平均值为0.92;(3)林分水平结构上,辐射强度由西北向东南递增;垂直结构上,随着林分密度减小,各层的阳生叶面积占比逐渐增加;(4)阳生叶的光合速率远高于阴生叶,最大值达到9.79μmol·m^(-2)·s^(-1),而阴生叶都小于0.7μmol·m^(-2)·s^(-1);(5)以净光合速率为依据,估算各时刻不同林分模式下的生物累积量,各林分模式下日生物累积量分别为17.54,17.10与15.93 kg。【结论】综合各种植模式下林分的光截获与分布情况,在郁闭之前,高LAI林分光截获能力更强,但分布较为聚集,实际阳生叶面积占比相对较小;当林分郁闭较低时,林内的光环境有所改善;根据各林分模式的阳生叶面积占比与生物累积量,综合考虑下,最优栽植模式为2.0 m×2.0 m,研究结果可为林分的种植管理与经营提供一定科学参考。【Objective】The study aimed to investigate the light interception of Chinese fir(Cunninghamia lanceolata)stands under different density patterns,and further estimate their biomass accumulation,so as to provide scientific references for the design and management of C.lanceolata plantation.【Method】The plant modeling method and virtual geographic environment technology were used to construct the 3D stand scene,and stand density was applied as the indicator to design different stand models.The photosynthetically active radiation and shadow area of each stand were simulated and calculated by the astronomical algorithm and radiosity model to evaluate the shade of the stand.Then the average net photosynthetic rate was estimated using the non-rectangular hyperbolic photosynthetic model and converted to biomass accumulation to evaluate the productive potential of each stand mode.【Result】(1)The light interception of stands with different densities increased with the increase of light intensity.The maximum PAR of the 1.5 m×1.5 m,2.0 m×2.0 m and 2.5 m×2.5 m stands was 1577.52,1568.68 and 1546.08μmol·m^(-2)·s^(-1),respectively.(2)Under the 2.5 m×2.5 m stand pattern,the proportion of sunshine leaf area at each time was the largest,with an average value of 0.92.(3)In the horizontal structure,the radiation intensity increased from northwest to southeast.In the vertical structure,with the decrease of stand density,the proportion of sunshine leaf area of each layer increased gradually.(4)The photosynthetic rate of the sunshine leaves was much higher than that of the shaded leaves,with a maximum value of 9.79μmol·m^(-2)·s^(-1),while the shaded leaves were all less than 0.7μmol·m^(-2)·s^(-1).(5)Based on the net photosynthetic rate,the biomass production of different stand modes at each time was estimated.The daily biomass accumulation of each stand mode was 17.54,17.10 and 15.93 kg,respectively.【Conclusion】According to the light interception and distribution of the stands under each planting mode,it can b

关 键 词：杉木 林分空间结构 虚拟植物 光合有效辐射 光合作用 

分 类 号：S791.27[农业科学—林木遗传育种]