暖温带地区3种森林群落叶面积指数和林冠开阔度的季节动态

doi:10.17521/cjpe.2007.0052

摘要/Abstract

摘要：

以辽东栎(Quercus liaotungensis)为主的落叶阔叶林、华北落叶松(Larix principis-rupprechtii)林和油松(Pinus tabulaeformis)林是暖温带林区具有代表性的森林群落类型。该研究应用国内外流行的半球图方法,通过对这3种森林群落叶面积指数和林冠开阔度的测定和综合比较,分析了叶面积指数和林冠开阔度的季节动态,揭示了暖温带地区不同类型森林群落叶面积指数和林冠开阔度的特征。研究结果表明,落叶阔叶林(优势种为辽东栎、棘皮桦(Betula dahurica)和五角枫(Acer mono))和华北落叶松林两种落叶森林群落的叶面积指数值均随生长季的到来而呈现增长的趋势,最大值出现在8月;林冠开阔度值随着生长季的到来而下降,最大值出现在11月。落叶阔叶林的叶面积指数和林冠开阔度的季节动态较之华北落叶松林明显。油松是常绿树种,其群落叶面积指数和林冠开阔度的变化程度均不明显,但林冠开阔度的变化趋势也是与叶面积指数的变化趋势相反。通过计算得出叶面积指数和林冠开阔度相关显著,并且呈现指数回归的关系。此研究结果为以遥感途径获取暖温带地区叶面积指数提供了地面校正依据,为研究该地区植被林冠的异质性及其造成的影响,以及进一步对该地区林分、景观和区域尺度上碳、水分和通量等方面的模拟提供了基础数据。

关键词: 叶面积指数, 林冠开阔度, 动态

Abstract:

Aims Leaf area index (LAI) and canopy openness are two important biophysical parameters of canopy structure related to water and carbon fluxes and light interception. They are not only key variables in ecological and climate models, but also important indicators of forest ecosystem productivity. Accurate estimates of LAI and canopy openness are required in studies of ecophysiology, atmosphere-ecosystem interactions, and global change. Many researches have been done in Dongling Mountain in the warm temperate zone; however, fewer studies have focused on LAI and canopy openness. The objective of this study is to measure and analyze the dynamics of LAI and canopy openness of three typical forest communities in this area. Results will be useful in testing and validating LAI estimations based on remote sensing, providing reference for study of canopy heterogeneity and its effects and modeling carbon, water and energy fluxes from stand to landscape levels.
Methods We used hemispherical photographs taken from the ground through a fisheye lens for indirectly assessing LAI and canopy openness. Photos were taken in May, August, September and November 2005 in deciduous broad-leaved forest (DBF), Larix principis-rupprechtii forest (LF) and Pinus tabulaeformis forest (PF).
Important findings The LAI of DBF and LF increased gradually with plant growth and development to August. The lowest value of canopy openness appeared in November. DBF maintained a higher LAI in August and was more open in November compared to LF. For PF, we observed few changes of LAI and canopy openness, which we attribute to leaf retention of this evergreen species. In all forests, canopy openness varied inversely with LAI. The correlation was exponential and significant; therefore, canopy openness is a good indicator of LAI in these forests.

Key words: leaf area index, canopy openness, dynamics

陈厦, 桑卫国. 暖温带地区3种森林群落叶面积指数和林冠开阔度的季节动态. 植物生态学报, 2007, 31(3): 431-436. DOI: 10.17521/cjpe.2007.0052

CHEN Sha, SANG Wei-Guo. DYNAMICS OF LEAF AREA INDEX AND CANOPY OPENNESS FOR THREE FOREST COMMUNITIES IN THE WARM TEMPERATE ZONE OF CHINA. Chinese Journal of Plant Ecology, 2007, 31(3): 431-436. DOI: 10.17521/cjpe.2007.0052

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2007.0052

https://www.plant-ecology.com/CN/Y2007/V31/I3/431

图/表 6

表1 3种森林群落基本情况

Table 1 The general information of the three forest communities

项目 Item	落叶阔叶林DBF	华北落叶松林LF	油松林 PF
海拔Elevation (m)	1 200	1 200	1 150
坡度 Slope	28°	26°	30°
坡向 Aspect	35° NW	40° NW	60° NE
密度 Density (trees·hm^-2)	1 262	2 700	2 000
胸径 DBH (m)	12.2	14.8	17.5
树高 Height (m)	6.8	17	18

图1 半球图的测定方案

Fig.1 Sampling scheme for hemispherical photograph

图2 3种森林群落的叶面积指数季节动态 DBF、LF、PF: 见表1

Fig.2 Dynamics of leaf area index (LAI) for the three forest communities DBF、LF、PF: See Table 1

图3 3种森林群落林冠开阔度的季节动态 DBF、LF、PF: 见表1

Fig.3 Dynamics of canopy openness for the three forest communities DBF、LF、PF: See Table 1

表2 3种森林群落8月的叶面积指数(LAI)和变异系数(CV)

Table 2 Leaf area index (LAI) and coefficient of variation (CV) for the three forest communities in August

群落类型 Type of community	LAI	CV (%)
落叶阔叶林DBF	2.90^a±0.52	17.93
华北落叶松林LF	2.54^b±0.36	14.17
油松林PF	2.28^c±0.24	10.53

图4 3种森林群落叶面积指数和林冠开阔度相关性分析 DBF、LF、PF: 见表1

Fig. 4 Relationship between leaf area index (LAI) and canopy openness for the three forest communities DBF、LF、PF: See Table 1

参考文献 29

[1]	Bréda NJJ (2003). Ground-based mesurements of leaf area index:a review of methods, instruments and current controversies. Journal of Experimental Botany, 54, 2403-2417. DOI URL PMID
[2]	Chen JM(1996). Optically-based methods for measuring seasonal variation of leaf area index in boreal conifer stands. Agricultural and Forest Meteorology, 80, 135-163. DOI URL
[3]	Chen JM, Cihlar J(1996). Retreiving leaf area index of boreal conifer forests using landsat TM images. Remote Sensing of Environment, 55, 153-162. DOI URL
[4]	Chen LZ(陈灵芝), Huang JH(黄建辉) (1997). Study on the Characteristics and Function of the Forest Ecosystem in the Warm Temperate Zone (暖温带森林生态系统结构与功能的研究). Science Press, Beijing. (in Chinese)
[5]	Eriksson H, Eklundh L, Hall K, Lindroth A(2005). Estimating LAI in deciduous forest stands. Agricultural and Forest Meteorology, 129, 27-37. DOI URL
[6]	Fang SZ(方升佐), Xu XZ(徐锡增), Lü SX(吕士行), Tang LZ(唐罗忠), Cao FL(曹福亮)(1998). Leaf area index and biomass productivity of mid- and short rotation poplar plantations for pulp timber. Chinese Journal of Applied Ecology (应用生态学报), 9, 225-230. (in Chinese with English abstract)
[7]	Fang XQ (方秀琴), Zhang WC(张万昌)(2003). The application of remotely sensed data to the estimation of the leaf area index. Remote Sensine for Land & Resources (国土资源遥感), 57(3), 58-62. (in Chinese with English abstract)
[8]	Fassnacht KS, Gower ST, Norman JM, McMurtrue RE(1994). A comparison of optical and direct methods for estimating foliage surface area index in forests. Agricultural and Forest Meteorology, 71, 183-207. DOI URL
[9]	Frazer GW, Canaham CD, Lertzman KP(1999). Gap Light Analyzer (GLA), Version 2.0: Imaging Software to Extract Canopy Structure and Gap Light Transmission Indices From True-Colour Fisheye Photographs, Users Manual and Program Documentation. Millbrook, New York.
[10]	Gholz HL(1982). Environmental limits on above-ground net primary production, leaf area and biomass in vegetation zones of the Pacific North West. Ecology, 63, 469-481. DOI URL
[11]	Hu LJ(胡良军), Shao MA(邵明安)(2001). Vegetation coverage index in soil and water loss studies. Journal of Northwest Forestry University (西北林学院学报), 16(1), 40-43. (in Chinese with English abstract)
[12]	Hui FM(惠凤鸣), Tian QJ(田庆久), Jin ZY(金震宇), Li HT(李海涛)(2003). Research and quantitative analysis of the correlation between vegetation index and leaf area index. Remote Sensing Information (遥感信息), (2), 10-13. (in Chinese with English abstract)
[13]	Inge J, Stefan F, Kris N, Bart M, Pol C, Marie W, Frédéris B(2004). Review of methods for in situ leaf area index determination. Ⅰ. Theories, sensors and hemispherical photograph. Agricultural and Forest Meteorology, 121, 19-35. DOI URL
[14]	Kucharik CJ, Norman JM, Gower ST(1998). Measurements of branch area and adjusting leaf area index indirect measurements. Agricultural and Forest Meteorology, 91, 69-88. DOI URL
[15]	Lassoies J, Hinckely TM (1991). Techniques and Approaches in Forest Physiology. CRC Press, Inc., Boca Raton.
[16]	Li XW(李小文), Wang JD(王锦地)(1995). Plant Photon Remote Sensing Model and Parameterizing of Plant Structure (植被光学遥感模型与植被结构参数化). Science Press, Beijing. (in Chinese)
[17]	Liu J(刘建), He WM(何维明), Fang ZL(房志玲)(2005). Spatial characteristics of soil moisture and organic matter and light in Pinus tabulaeformis forest and Quercus liaotungensis forest on Dongling Mountain, Beijing, China. Acta Ecologica Sinica (生态学报), 25, 2954-2960. (in Chinese with English abstract)
[18]	McNaughton KG (1983). Predicting effects of vegetation on changes on transpiration and evaporation. In: Kozlowski TT ed. Water Deficits and Plant Growth.. Academic Press, Londong, 718.
[19]	Pierce LL, Running RW(1998). Rapid estimation of coniferous forest leaf area index using a portable integrating radiometer. Ecology, 69, 1762-1767. DOI URL
[20]	Running SW, Coughlan JC(1988). A general model of forest ecosystem processes for regional applications. Ⅰ. Hydrologic balance, canopy gas exchange and primary production processes. Ecological Modelling, 42, 125-154. DOI URL
[21]	Vales DJ, Bunnell FL(1998). Comparison of methods for estimating forest overstory cover. Ⅰ. Observer effects. Canadian Journal of Forest Research, 18, 606-609. DOI URL
[22]	Wang XQ(王希群), Ma LY(马履一), Jia ZK(贾忠奎), Xu CY(徐程扬)(2005). Research and application advances in leaf area index. Chinese Journal of Ecology (生态学杂志), 24, 537-541. (in Chinese with English abstract)
[23]	Zhang HQ(张红旗), Chen YR(陈永瑞), Niu D(牛栋)(2004). Retrieving effective leaf area index of conifer forests using Landsat TM images in red soil hilly region. Acta Agriculturae Universitatis Jiangxiensis (江西农业大学学报), 26, 159-163. (in Chinese with English abstract)
[24]	Zhang JH(张佳华) (2001). Study on models for evaluating primary productivity of natural vegetation and crop yield. Acta Agriculturae Shanghai (上海农业学报), 17, 83-89. (in Chinese with English abstract)
[25]	Zhang ZP(张祝平) (1990). The radiation absorption efficiency of photosynthesis of the forest communities in the Dinghu Mountain. Acta Phytoecologica et Geobotanica Sinica (植物生态学与地植物学学报), 14, 139-150. (in Chinese with English abstract)
[26]	Zhao P(赵平), Zeng XP(曾小平), Cai XA(蔡锡安), Peng SL(彭少麟)(2002). Report on measurement of leaf area index of low subtropical forests by using digital plant canopy imager. Guihaia (广西植物), 22, 485-489. (in Chinese with English abstract)
[27]	Zhou YY(周宇宇), Tang SH(唐世浩), Zhu QJ(朱启疆), Li JT(李江涛), Sun R(孙睿), Liu SH(刘素红)(2003). Measurement of LAI in Changbai Mountains nature reserve and its result. Resources Science (资源科学), 25(6), 38-42. (in Chinese with English abstract)
[28]	Zhu JJ(朱教君) (2003). Method for measurement of optical stratification porosity (OSP) and its application in studies of management for secondary forests. Chinese Journal of Applied Ecology (应用生态学报), 14, 1229-1233. (in Chinese with English abstract)
[29]	Zhu CQ(朱春全), Lei JP(雷静品), Liu XD(刘晓东), Wang FG(王富国), Cheng GZ(成桂珍)(2001). The distribution and seasonal change of leaf area in poplar plantations managed in different ways. Scientia Silvae Sinicae (林业科学), 37(1), 46-51. (in Chinese with English