红壤丘陵区马尾松林和湿地松林物候特征的时空变异及影响因素

doi:10.11707/j.1001-7488.LYKX20230408

Abstract

Abstract:

Objective: The study aims to investigate the temporal-spatial variation and drivers of phenological periods in Pinus massoniana and Pinus elliottii forests, in order to provide a theoretical basis for understanding and predicting the temporal-spatial pattern of forest carbon sink in the red soil hilly region. Method: The temporal and spatial dynamics of the effective leaf area index (LAIe) were extracted from a total of 29 plots (18 for P. massoniana and 11 for P. elliottii), based on digital camera time series data collected between 2017 and 2021. A generalized double logistic model of LAIe was used to determine the phenological periods (start time of growing season, SOS; end of growing season, EOS; length of growing season, LOS). The coefficient of variation was used to characterize the spatiotemporal variation amplitude of phenological periods. Pearson correlation analysis and linear mixed model were employed to investigate the driving effects of climate (aridity index, air temperature, precipitation, saturation vapor pressure deficit, photosynthetically active radiation), soil (soil temperature and humidity, soil thickness, soil gravel content) and biological (stand density, understory vegetation richness) factors on phenological periods. Result: 1) The phenological characteristics of P. massoniana and P. elliottii forests exhibited a unimodal curve, with the former lacking an obvious peak. Compared to P. massoniana forest, the P. elliottii forest had later SOS but higher LAIe with greater amplitude of seasonal variation. 2) The phenological periods of P. massoniana forest exhibited greater variability than those of P. elliottii forest at both temporal and spatial scales. P. massoniana forest had greater spatial variation coefficients of SOS, EOS, and LOS and exhibited greate temporal variation coefficient of SOS than those in P. elliottii forest. 3) On an interannual scale, SOS and EOS in P. massoniana forest showed negative and positive correlations with soil moisture at 0–120 cm depth in early spring and dry season, while EOS in P. elliottii forest was positively correlated with soil moisture at 0–60 cm depth in dry season. 4) The spatial variation of phenological periods in P. massoniana forests was influenced by stand density, species richness in the herbaceous layer, and gravel content within the 0–60 cm soil layer. Conclusion: There are significant differences in the phenological characteristics between P. massoniana and P. elliottii forests in terms of curve peak value, SOS, and LAIe amplitude and value. The phenological period in P. elliottii forests is more stable in temporal and spatial scale. The temporal and spatial variation patterns of phenology in P. massoniana forests within the red soil hilly region are jointly influenced by intraspecific and interspecific competition intensity, as well as soil resource heterogeneity.

Key words: forest phenology, the effective leaf area index, temporal-spatial variation, gravel content, competitive intensity, soil moisture content

CLC Number:

Bingnan Chen,Fengting Yang,Shengwang Meng,Xiaoqin Dai,Liang Kou,Yifan Chen,Huimin Wang,Xiaoli Fu. Temporal-Spatial Variation and Drivers of Phenology in Pinus massoniana and Pinus elliottii Forests in Hilly Regions with Red Soil[J]. Scientia Silvae Sinicae, 2024, 60(8): 67-78.

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参数 Parameter	马尾松 P. massoniana		湿地松 P. elliottii
参数 Parameter	平均值 Mean	变异系数 CV (%)	平均值 Mean	变异系数 CV (%)
林分密度 Stand density/(tree·hm^?2)	1 089.51±65.40a	25.47	532.32±19.45b	12.12
林龄 Age/a	37a	—	37a	—
透光度 Light transmission (%)	38.07±1.18a	13.20	41.54±1.36a	10.86
胸径 Diameter at breast height/cm	15.97±0.13a	34.26	22.31±0.26b	26.69
灌木层物种丰富度 Shrubs richness	5.65±0.30a	22.39	5.35±0.31 a	19.17
草本层物种丰富度 Herbs richness	1.55±0.15a	40.13	1.45±0.20a	45.80
土层厚度 Soil thickness/cm	111±7a	24.94	141±11b	25.52
0~60 cm土层石砾含量 Soil gravel content at 0-60cm depth (%)	10.86±2.12a	89.89	3.88±1.05b	82.92

变异 Variation	马尾松 P. massoniana			湿地松 P. elliottii
变异 Variation	SOS	EOS	LOS	SOS	EOS	LOS
时间变异 Temporal variation	15.21	19.33	30.78	5.69	19.79	31.24
空间变异 Spatial variation	42.93	8.98	24.01	9.81	3.18	6.13

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[2]	Wang Linghe;Zhang Guosheng;Sui Mingjie;Liu Meizhen. STUDY ON SPROUTING OF ADVENTITIOUS ROOTS OF SABINA VULGARIS IN MU US SANDY LAND [J]. Scientia Silvae Sinicae, 2002, 38(5): 156-159.

Temporal-Spatial Variation and Drivers of Phenology in Pinus massoniana and Pinus elliottii Forests in Hilly Regions with Red Soil

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