Response of Net Photosynthetic Rate of Larix gmelinii to Physiological and Ecological Factors in Different Phenophases

doi:10.13466/j.cnki.lczyyj.2024.02.012

Abstract

Abstract:

Studying the changes in the net photosynthetic rate(P_n) of Larix gmelinii in different phenophases and identifying its main influencing factors can help to elucidate the process and mechanism of carbon assimilation of Larix gmelinii.The LI-6400XT portable photosynthetic measurement system was used to measure the net photosynthetic rate,leaf temperature(T_leaf),stomatal conductance(G_S),intercellular CO₂ concentration(C_i),chlorophyll content(L_Chl),nitrogen content(L_N),photosynthetic active radiation(P_AR),air temperature(Ta),atmospheric CO₂ concentration(C_a) and vapor pressure deficit(VPD)of Larix gmelinii natural forest in the leaf opening period(LOP),leaf spreading period(LSP) and leaf discoloring period(LDP).Pearson correlation analysis and stepwise regression analysis were used to systematically study the variation characteristics of P_n in different phenophases of L.gmelinii and its relationship with physiological,ecological factors and material content.The results showed that:1) The order of P_n of Larix gmelinii was LSP>LDP>LOP,upper leaves>middle leaves>lower leaves,and the difference was significant;sun leaves>shade leaves,the difference was not significant.2) P_n was significantly or extremely significantly positively correlated with P_AR,T_a,T_leaf and G_S,and significantly or extremely significantly negatively correlated with C_i in different phenophases of L.gmelinii.3) The response of P_n of Larix gmelinii to physiological and ecological factors was dissimilar in different phenophases and at different canopy heights.The main control factors were P_AR,T_a and G_S.In addition,it was also affected by T_leaf,V_PD and C_i.There were significant differences in the net photosynthetic rate of L.gmelinii natural forest in different phenophases and at different canopy heights.When estimating carbon flux,the relative contribution of net photosynthetic rate of leaves at different canopy heights should be considered.

Key words: net photosynthetic rate, physiological and ecological factors, different phenophases, Larix gmelinii

CLC Number:

S791.22

GUAN Lei, ZHANG Xin, ZHANG Qiuliang, JIAN Ya’nan, ZHANG Yongliang. Response of Net Photosynthetic Rate of Larix gmelinii to Physiological and Ecological Factors in Different Phenophases[J]. Forest and Grassland Resources Research, 2024, (2): 101-108.

Figures/Tables 6

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叶片生境	展叶初期			展叶盛期				叶变色期
叶片生境	L_Chl/(mg/g)	L_N/%		L_Chl/(mg/g)		L_N/%		L_Chl/(mg/g)		L_N/%
上层阳生叶	0.66±0.08Bb	2.77±0.61Aa	1.21±0.06Ab		1.59±0.11Ba		0.82±0.12Bcd		1.38±0.16Ba
上层阴生叶	0.68±0.07Bb	0.79±0.11Bd	1.20±0.07Ab		1.55±0.06Ba		0.79±0.11Bd		1.31±0.16Ba
中层阳生叶	0.88±0.04Bab	0.88±0.13Bbcd	1.28±0.07Aab		1.63±0.07Ba		0.88±0.13Bbcd		1.43±0.09Ba
中层阴生叶	0.89±0.06Bab	0.99±0.12Bab	1.35±0.07Aab		1.62±0.04Ba		0.99±0.12Bab		1.39±0.14Ba
下层阳生叶	0.77±0.09Bb	0.95±0.12Babc	1.44±0.07Aa		1.51±0.06Ba		0.95±0.12Babc		1.26±0.10Ba
下层阴生叶	1.02±0.10Ba	1.06±0.16Ba	1.47±0.06Aa		1.54±0.04Ba		1.06±0.16Ba		1.32±0.07Ba

物候期	冠层高度	T_leaf	G_S	C_i	L_Chl	L_N	P_AR	T_a	C_a	V_PD
	上层	0.956^**	0.874^**	-0.906^*	-0.162	-0.138	0.742^*	0.973^**	0.245	0.030
展叶初期	中层	0.994^**	0.859^**	-0.919^**	0.003	-0.200	0.984^**	0.972^**	-0.973^**	0.967^**
	下层	0.934^**	0.761^*	-0.846^*	0.690	-0.154	0.686^*	0.995^**	-0.584	0.584
	上层	0.784^**	0.927^**	-0.639^**	0.154	0.121	0.847^**	0.819^**	-0.363	0.600^**
展叶盛期	中层	0.848^**	0.958^**	-0.567^*	-0.009	0.297	0.879^**	0.861^**	-0.767^**	0.628^**
	下层	0.746^**	0.913^**	-0.622^**	0.218	-0.038	0.938^**	0.829^**	-0.497^*	0.435
	上层	0.932^**	0.692^*	-0.938^**	0.901^**	0.779^*	0.817^*	0.942^**	-0.952^**	0.969^**
叶变色期	中层	0.906^**	0.714^*	-0.881^**	0.795^*	0.788^*	0.856^**	0.908^**	-0.906^**	0.905^**
	下层	0.969^**	0.840^**	-0.979^**	0.871^**	0.707^*	0.916^**	0.970^**	-0.956^**	0.926^**

物候期	冠层高度	逐步回归方程	拟合度(R²)	显著性(P)	样本数量/个
	上层	P_n=-2.171+0.001 P_AR -0.456 T_a	0.946	<0.001	54
展叶初期	中层	P_n=-3.746+0.006 P_AR -0.501 T_leaf	0.988	<0.001	54
	下层	P_n =-2.181-0.350 T_a +15.932 G_S	0.991	<0.001	54
	上层	P_n=+0.010-0.360 T_a +0.004 P_AR	0.867	<0.001	162
展叶盛期	中层	P_n=-3.228-0.672 T_a -4.334 V_PD +12.689 G_S	0.855	<0.001	162
	下层	P_n =-0.826-0.291 T_a +0.005 P_AR +14.798 G_S	0.831	<0.001	162
	上层	P_n =-0.727-0.293 T_a +12.558 G_S	0.825	<0.001	72
叶变色期	中层	P_n =1.373+0.004 P_AR +4.801 V_PD	0.939	<0.001	72
	下层	P_n=6.553-0.016 C_i +0.116 T_leaf +14.563 G_S	0.984	<0.001	72