林下植被清除对不同径级中龄杉木生长速率的影响机制

doi:10.11707/j.1001-7488.20201103

Abstract

Abstract:

Objective: The study aims to determine how growth rate of middle-aged Chinese fir responds to understory management. Method: This study was conducted in the framework of an understory management experiment ofsubtropical middle-aged Chinese fir established in 2013. The plantation on the platform was established in 1998. Weset a paired-treatment experiment, with understory left intact in one treatment (CK) and understory removed for the other treatment(UR). By 2016, trees with DBH classes of 12-14 cm and 16-18 cm accounted for 42.6% in CK treatment and 77.1% in UR treatment. During 2016-2018, we studied the stoichiometry, resource acquisition and utilization efficiency, carbon allocation patterns (e.g., structural vs non-structural carbohydrates (NSC) allocations and NSC allocations among different organs) and relative growth rate (RGR) of trees withthese two DBHclasses. Result: The effects of understory removal on the RGR of middle-aged Chinese fir depended on DBH. The understory removal had no significant effect on the RGR of the Chinese fir with 12-14 cm DBH, however decreased the RGR of the Chinese fir with 16-18 cm DBH. For the Chinese fir of 12-14 cm and 16-18 cm DBH classes, the understory removal had no significant effect on the maximum photosynthetic rate, instantaneous water-use efficiency, instantaneous nitrogen-use efficiency, leaf total nitrogen (N) content, leaf total phosphorus (P) content, leaf N/P, leaf NSC(NSC_leaf), branch NSC(NSC_branch), and trunk NSC(NSC_trunk). For the Chinese fir with16-18 cm DBH, understory removal significantly reduced the NSC of new leaves (especially soluble sugar, SS), increased NSC_trunk/RGR and NSC_leaf/RGR (indicatinga priority of carbon storage over growth), and thus decreased the RGR. For the Chinese fir with 12-14 cm DBH, although the understory removal significantly increased the ratio of new leaf SS and old leaf SS, the NSC_leaf/RGR was the main factor in regulating the RGR and the understory removal did not significantly affect NSC_leaf/RGR of Chinese fir with this DBH class. Conclusion: The DBH-dependent effects of understory removal on the growth rate of middle-aged Chinese fir are mainly controlled by carbon allocation rather than by nutrient stoichiometry, resource acquisition efficiency, and utilization efficiency. Objective: The study aims to determine how growth rate of middle-aged Chinese fir responds to understory management. Method: This study was conducted in the framework of an understory management experiment ofsubtropical middle-aged Chinese fir established in 2013. The plantation on the platform was established in 1998. Weset a paired-treatment experiment, with understory left intact in one treatment (CK) and understory removed for the other treatment(UR). By 2016, trees with DBH classes of 12-14 cm and 16-18 cm accounted for 42.6% in CK treatment and 77.1% in UR treatment. During 2016-2018, we studied the stoichiometry, resource acquisition and utilization efficiency, carbon allocation patterns (e.g., structural vs non-structural carbohydrates (NSC) allocations and NSC allocations among different organs) and relative growth rate (RGR) of trees withthese two DBHclasses. Result: The effects of understory removal on the RGR of middle-aged Chinese fir depended on DBH. The understory removal had no significant effect on the RGR of the Chinese fir with 12-14 cm DBH, however decreased the RGR of the Chinese fir with 16-18 cm DBH. For the Chinese fir of 12-14 cm and 16-18 cm DBH classes, the understory removal had no significant effect on the maximum photosynthetic rate, instantaneous water-use efficiency, instantaneous nitrogen-use efficiency, leaf total nitrogen (N) content, leaf total phosphorus (P) content, leaf N/P, leaf NSC(NSC_leaf), branch NSC(NSC_branch), and trunk NSC(NSC_trunk). For the Chinese fir with16-18 cm DBH, understory removal significantly reduced the NSC of new leaves (especially soluble sugar, SS), increased NSC_trunk/RGR and NSC_leaf/RGR (indicatinga priority of carbon storage over growth), and thus decreased the RGR. For the Chinese fir with 12-14 cm DBH, although the understory removal significantly increased the ratio of new leaf SS and old leaf SS, the NSC_leaf/RGR was the main factor in regulating the RGR and the understory removal did not significantly affect NSC_leaf/RGR of Chinese fir with this DBH class. Conclusion: The DBH-dependent effects of understory removal on the growth rate of middle-aged Chinese fir are mainly controlled by carbon allocation rather than by nutrient stoichiometry, resource acquisition efficiency, and utilization efficiency.

Key words: Chinese fir, understory removal, non-structural carbohydrate, carbon allocation, stoichiometry, resource acquisition efficiency, resource utilization efficiency

CLC Number:

S718.43

Yifan Chen,Xiaoli Fu,Huimin Wang,Xiaoqin Dai,Liang Kou,Fusheng Chen,Wensheng Bu. Effects of Understory Removal on Growth Rate of Middle-Aged Chinese Fir with Different DBH Classes[J]. Scientia Silvae Sinicae, 2020, 56(11): 21-30.

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References 0

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	最大净光合速率 A_max/(μmol·m^-2s^-1)	水分利用效率 WUE/(μmol·mmol^-1)	光合氮素利用效率 PNUE/(μmol·g^-1s^-1)
12~14 cm径级-清除林下植被S-UR	2.68±0.35a	4.28±0.74a	2.04±0.29a
12~14 cm径级-保留林下植被S-CK	2.21±0.59a	2.52±0.61ab	1.17±0.47a
16~18 cm径级-清除林下植被B-UR	2.97±0.45a	2.95±0.59ab	2.20±0.35a
16~18 cm径级-保留林下植被B-CK	1.89±0.48a	1.63±0.81b	1.26±0.35a
径级DBH	P=0.970	P=0.171	P=0.683
林下植被管理Understory treatment	P=0.111	P=0.060	P=0.099
径级×林下植被管理DBH× Understory treatment	P=0.524	P=0.779	P=0.410

	全氮 TN/(mg·g^-1)	全磷 TP/(mg·g^-1)	氮磷比 N/P
12~14 cm径级-清除林下植被S-UR	11.25±0.27ab	0.87±0.02a	13.03±0.31a
12~14 cm径级-保留林下植被S-CK	10.89±0.30b	0.86±0.31a	12.74±0.31a
16~18 cm径级-清除林下植被B-UR	11.63±0.42ab	0.83±0.03a	14.06±0.48a
16~18 cm径级-保留林下植被B-CK	12.20±0.68a	0.87±0.04a	13.93±0.49a
径级DBH	P=0.048	P=0.743	P=0.013
林下植被管理Understory treatment	P=0.797	P=0.597	P=0.632
径级×林下植被管理DBH× Understory treatment	P=0.268	P=0.411	P=0.849

	叶非结构性碳水化合物 NSC_leaf(%)	枝条非结构性碳水化合物 NSC_branch(%)	树干非结构性碳水化合物 NSC_trunk(%)
12~14 cm径级-清除林下植被S-UR	4.73±0.17a	4.13±0.24a	0.35±0.03a
12~14 cm径级-保留林下植被S-CK	5.00±0.18a	4.11±0.31a	0.39±0.06a
16~18 cm径级-清除林下植被B-UR	4.78±0.16a	3.89±0.19a	0.37±0.03a
16~18 cm径级-保留林下植被B-CK	5.11±0.12a	3.86±0.20a	0.43±0.11a
径级DBH	P=0.660	P=0.354	P=0.558
林下植被管理Understory treatment	P=0.103	P=0.928	P=0.355
径级×林下植被管理DBH×Understory treatment	P=0.890	P=0.996	P=0.835

径级 DBH class	自变量 Independent variable	标准系数 Standard coefficient	t值 t-value	显著性 sig.	解释度 Explained variability(%)
12~14 cm	NSC_leaf/RGR	-0.749	-4.928	0.000	56.1
16~18 cm	NSC_leaf/RGR	-0.778	-5.998	0.000	58.7
	SS_nl	0.422	3.253	0.006	17.8

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Effects of Understory Removal on Growth Rate of Middle-Aged Chinese Fir with Different DBH Classes

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