干旱区生态环境知识资源中心(Arid): 半干旱沙地樟子松林降雨再分配特征

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	半干旱沙地樟子松林降雨再分配特征
其他题名	Precipitation redistribution characteristics of Pinus sylvestris var. mongolica in semiarid sandy land
	孙姗姗; 刘新平; 王翠萍; 张铜会; 何玉惠; 吕朋; 车力木格; 张腊梅; 王明明; 程莉
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2021
卷号	44 期号:1 页码:109-117
中文摘要	森林植被的降雨再分配过程是影响区域水资源利用效率以及生态系统生产力的重要因素。于2018年5-8月观测27 a生樟子松人工林降雨再分配特征,探究降雨再分配的比例变化对林地水分平衡的影响机制,分析、量化林内穿透雨、林冠截留、树干径流、枯落物层入渗部分产生的阈值。结果表明:樟子松林内穿透雨量占同期降雨量的86.45%,穿透雨量随着降雨量的增加呈线性增加趋势,降雨量>0.63 mm时产生穿透雨;林冠截留量和树干径流量分别占降雨量的10.44%和2.54%,树干径流量与降雨量之间呈正线性关系,降雨量>1.19 mm时,产生树干径流;枯落物层截留量占降雨量的12.37%,枯落物层截留量随着降雨量的增加而增加;枯落物在0~24 h内平均吸水速率为1.83 mm·h~(-1),其最大持水量为3.23 mm,并且枯落物层截留量占其最大持水量的42.37%。从林冠到枯落物各层截留总量为25.35%,其中有74.65%的雨水最后从枯落物层入渗进入地表,用于补充土壤水分、下渗或补充地下水。半干旱沙地樟子松林可以有效地发挥截留降雨、贮存雨水的功能,继而改善沙地土壤含水量和地下水的有效补给量,提高森林生态系统生产力。
英文摘要	The precipitation redistribution process of forest vegetation is an essential factor affecting regional water use efficiency and ecosystem productivity, which can also regulate the mechanism of water resource balance. The precipitation interception by vegetation during and after rain events is an important component of the hydrological cycle of forest ecosystems in arid and semiarid sandy grassland. Pinus sylvestris var. mongolica Litv. is the main water and soil conservation species in the semiarid sandy land. It plays a significant role in regulating regional hydrological processes. There was the water resource deficit and water level drop in Horqin Sandy Land, the precipitation interception by Pinus sylvestris var. mongolica planted forest can affect the regional ecological environment. We investigated the precipitation redistribution characteristics of Pinus sylvestris var. mongolica planted forest in Horqin Sandy Land from May to August in 2018. The study aims to analyze and quantize precipitation redistribution patterns (throughfall, canopy interception, stemflow, and litter layer interception) of Pinus sylvestris var. mongolica. Simultaneously, we calculated how many precipitation magnitudes distributed to the surface soil, to evaluate the regional soil water content and effective supply of groundwater in the planted forest of Pinus sylvestris var. mongolica. A canopy of Pinus sylvestris var. mongolica is the first layer affecting precipitation redistribution. Canopy interception rate decreased and then stabilized with the precipitation increase, which also can be linearly correlated with canopy closure and leaf area index, which is affected by its canopy structure. The atmospheric precipitation passes through the forest canopy to form throughfall, canopy interception, stemflow. Throughfall of Pinus sylvestris var. mongolica accounted for 86.45% of the total precipitation, and linearly increased with the precipitation (y=0.8994x-0.5655, R~2=0.9961, P<0.0001). Throughfall occurred when the precipitation exceeded 0.63 mm. The canopy interception and stemflow accounted for 10.44% and 2.54% of the total precipitation, respectively. There was the power function relationship between canopy interception and precipitation (y=1.4978(1-e-0.0526x), R~2=0.8230, P<0.0001), and the positive linear relationship between stemflow and precipitation (y=0.0273x - 0.0324, R~2=0.9491, P<0.0001), stemflow occurred when the precipitation exceeded 1.19 mm. The litter is the second active layer affecting the precipitation redistribution, the interception of the litter layer accounted for 12.37% of the total precipitation and increased with precipitation (y=4.1580(1-e- 0.0545x), R~2=0.8536, P<0.0001). The average water absorption rate of litter in the range of 0-24 h was 1.83 mm·h ~(- 1). The maximum water holding capacity was 3.23 mm, and the interception of the litter layer accounted for 42.37% of its maximum water holding capacity. The total interception from the canopy to the litter was 25.35%. The remaining 74.65% precipitation finally infiltrated into the soil surface from the litter layer to replenish soil moisture and groundwater. We obtained that the rainfall redistribution patterns of Pinus sylvestris var. mongolica forest varied with the precipitation characteristics (such as precipitation amount and intensity) and its canopy structure characteristics. The Pinus sylvestris var. mongolica forest can effectively intercept and store precipitation. Thus, increasing water effective recharge of forest land will improve the relationship between vegetation and precipitation to enhance the productivity of the forest ecosystem.
中文关键词	樟子松林 ; 降雨再分配 ; 冠层截留 ; 枯落物层截留 ; 科尔沁沙地
英文关键词	Pinus sylvestris var. mongolica precipitation redistribution canopy layer interception litter layer interception Horqin Sandy Land
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Forestry
CSCD记录号	CSCD:6933908
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/377620
作者单位	孙姗姗, 中国科学院西北生态环境资源研究院;;中国科学院大学, 中国科学院奈曼沙漠化研究站;;, 兰州;;, 甘肃;;北京 730000;;100101, 中国.; 吕朋, 中国科学院西北生态环境资源研究院;;中国科学院大学, 中国科学院奈曼沙漠化研究站;;, 兰州;;, 甘肃;;北京 730000;;100101, 中国.; 车力木格, 中国科学院西北生态环境资源研究院;;中国科学院大学, 中国科学院奈曼沙漠化研究站;;, 兰州;;, 甘肃;;北京 730000;;100101, 中国.; 王明明, 中国科学院西北生态环境资源研究院;;中国科学院大学, 中国科学院奈曼沙漠化研究站;;, 兰州;;, 甘肃;;北京 730000;;100101, 中国.; 程莉, 中国科学院西北生态环境资源研究院;;中国科学院大学, 中国科学院奈曼沙漠化研究站;;, 兰州;;, 甘肃;;北京 730000;;100101, 中国.; 刘新平, 中国科学院西北生态环境资源研究院, 中国科学院奈曼沙漠化研究站, 兰州, 甘肃 730000, 中国.; 张铜会, 中国科学院西北生态环境资源研究院, 中国科学院奈曼沙漠化研究站, 兰州, 甘肃 730000, 中国.; 何玉惠, 中国科学院西北生态环境资源研究院, 中国科学院奈曼沙漠化研究站, 兰州, 甘肃 730000, 中国.; 王翠萍, 国家林业和草原局西北调查规划设计院, 西安, 陕西 710048, 中国.; 张腊梅, 甘肃省通渭县林业和草原服务中心, 定西, 甘肃 743300, 中国.
推荐引用方式 GB/T 7714	孙姗姗,刘新平,王翠萍,等. 半干旱沙地樟子松林降雨再分配特征[J],2021,44(1):109-117.
APA	孙姗姗.,刘新平.,王翠萍.,张铜会.,何玉惠.,...&程莉.(2021).半干旱沙地樟子松林降雨再分配特征.干旱区地理,44(1),109-117.
MLA	孙姗姗,et al."半干旱沙地樟子松林降雨再分配特征".干旱区地理 44.1(2021):109-117.