LEAF AREA CHARACTERISTICS OF PLANTATION STANDS IN SEMI-ARID LOESS HILL-GULLY REGION OF CHINA

doi:10.3773/j.issn.1005-264x.2008.02.023

Abstract

Abstract:

Aims Our objectives are to explore the relationship of leaf area and stand density and determine a convenient way to measure stand leaf area.
Methods Using direct and indirect methods during the growing season (from May to October) of 2004, we measured seasonal variation of the leaf area of tree and shrub species: Robinia pseudoacacia stands with four densities (3 333, 1 666, 1 111 and 833 plants per hm ²), Platycladus orientalis stands with three densities (3 333, 1 666 and 1 111 plants per hm ²), Caragana korshinskii, Hippophae rhamnoides and Amorpha fruticosa. We developed formulas for leaf area by correlating leaf fresh weight, diameter of base branch and leaf area.
Important findings Maximum leaf area and leaf area index (LAI) occurred in September for trees and August for shrubs. There is a significant power relation between leaf area and leaf fresh weight for Robinia pseudoacacia, significant linear relation between leaf area and leaf fresh weight for P. orientalis, C. korshinskii, H. rhamnoides and A. fruticosa, significant power relation between leaf area and diameter of base branch for C. korshinskii, and significant linear relation between leaf area and diameter of base branch for H. rhamnoides and A. fruticosa. After the planted vegetation in Loess hilly-gully region enters into a rapid growth stage, the LAI of R. pseudoacacia stands with different densities converge and LAI is not affected by initial or current density. This was also observed for P. orientalis stands. However, the leaf area of individual trees is negatively linearly related with stand density. Robinia pseudoacacia stands and P. orientalis stands have reached their maximum bearing capacities in the Loess hilly-gully region as a result of limited soil water. Therefore, to improve the quality of individual trees, we recommend stand densities not exceed 833 and 1 111 plants per hm ² for R. pseudoacacia and P. orientalis, respectively. To improve the quality of entire stands, we suggest reducing the density a little.

Key words: leaf area, leaf area index, Robinia pseudoacacia, Platycladus orientalis, Loess hilly-gully region

YIN Jing, QIU Guo-Yu, HE Fan, HE Kang-Ning, TIAN Jing-Hui, ZHANG Wei-Qiang, XIONG Yu-Jiu, ZHAO Shao-Hua, LIU Jian-Xin. LEAF AREA CHARACTERISTICS OF PLANTATION STANDS IN SEMI-ARID LOESS HILL-GULLY REGION OF CHINA[J]. Chin J Plant Ecol, 2008, 32(2): 440-447.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2008.02.023

https://www.plant-ecology.com/EN/Y2008/V32/I2/440

Figures/Tables 11

References 24

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树种 Species	造林时间 Planting time	林分密度 Density (株·hm^-2)	造林规格 Specification (m×m)	平均树高 Average height (m)	平均胸径 Average diameter (cm)	郁闭度 Forest closure	生物量 Biomass (kg·hm^-2)	坡向 Aspect	坡度 Slope
刺槐	1986年	3 333	1.5×2	7.99	7.87	1.0	41 089	N 180°	20°
Robinia		1 666	1.5×4	8.61	9.14	1.0	78 583	N 180°	20°
pseudoacacia		1111	1.5×6	8.98	10.47	0.8	74 625	N 200°	20°
		833	1.5×8	9.82	11.62	0.7	69 058	N 190°	18°
侧柏	1993年	3 333	1.5×2	5.43	5.93	0.8	34 070	N 200°	15°
Platycladus		1 666	1.5×4	5.77	6.55	0.7	43 632	N 200°	16°
orientalis		1 111	1.5×6	6.08	6.81	0.6	41 058	N 200°	14°

树种 Species	造林时间 Planting time	林分密度 Density (株·hm^-2)	造林规格 Specification (m×m)	平均树高 Average height (m)	平均胸径 Average diameter (cm)	郁闭度 Forest closure	生物量 Biomass (kg·hm^-2)	坡向 Aspect	坡度 Slope
刺槐	1986年	3 333	1.5×2	7.99	7.87	1.0	41 089	N 180°	20°
Robinia		1 666	1.5×4	8.61	9.14	1.0	78 583	N 180°	20°
pseudoacacia		1111	1.5×6	8.98	10.47	0.8	74 625	N 200°	20°
		833	1.5×8	9.82	11.62	0.7	69 058	N 190°	18°
侧柏	1993年	3 333	1.5×2	5.43	5.93	0.8	34 070	N 200°	15°
Platycladus		1 666	1.5×4	5.77	6.55	0.7	43 632	N 200°	16°
orientalis		1 111	1.5×6	6.08	6.81	0.6	41 058	N 200°	14°

树种 Species	5月 May	7月 July	8月 August	10月 October
柠条 Caragana korshinskii	55.42	59.38	62.47	47.46
沙棘 Hippophae rhamnoides	54.78	58.36	65.70	52.43
紫穗槐 Amorpha fruticosa	56.47	61.15	59.50	52.83
刺槐 Robinia pseudoacacia	51.03	71.74	65.60	59.98
侧柏 Platycladus orientalis	52.26	58.24	57.65	55.46

树种 Species	5月 May	7月 July	8月 August	10月 October
柠条 Caragana korshinskii	55.42	59.38	62.47	47.46
沙棘 Hippophae rhamnoides	54.78	58.36	65.70	52.43
紫穗槐 Amorpha fruticosa	56.47	61.15	59.50	52.83
刺槐 Robinia pseudoacacia	51.03	71.74	65.60	59.98
侧柏 Platycladus orientalis	52.26	58.24	57.65	55.46

树种 Species	月份 Month	叶鲜重与叶面积回归方程 Regression equation of leaf fresh weight and leaf area	R²	F	自由度 Freeness
刺槐 Robinia pseudoacacia	5~7	Y=89.513 1X^{0.987 2}	0.998^**	29 548.9	1
	8~9	Y=80.876 4X^1.013	0.998^**	12 849.3	1
	10	Y=73.975 9X^{0.985 5}	0.996^**	5 167.5	1
侧柏 Platycladus orientalis	5~10	Y=16.615 9X+0.774 7	0.981^**	2 317.2	1