Effect of Throughfall Reduction on Sap Flow of Pinus sylvestris var.mongolica in Sandy Land of Northwest Liaoning

doi:10.13466/j.cnki.lczyyj.2023.06.017

Abstract

Abstract:

In order to investigate the effect of reduced throughfall on the stem sap flow rate of Pinus sylvestris var.mongolica and its relationship with environmental factors,we uesed the thermal diffusion sap flow probe (TDP)to continuously monitor the stem sap flow rate of Pinus sylvestris var.mongolica plantation in northwest Liaoning,along with various environmental factors.The study site was divided into plots with reduced throughfall (30% artificial interception)and plots with normal rainfall.This paper analyzes and discusses the daily,nightly,and monthly variations in stem sap flow rate of Pinus sylvestris var.mongolica under different weather conditions,utilizing the data of stem sap flow from April to October (growing season)of 2018.The findings of this study are as follows:1)The sap flow rate of Pinus sylvestris var.mongolica was significantly higher in the throughfall reduction plots compared to the control group.The difference in sap flow rate between daytime and nighttime varied with different weather conditions,with the highest difference observed under sunny conditions,followed by rainy and cloudy conditions.2)Following rainfall,the onset of stem sap flow in the throughfall reduction plots was earlier than in the control group,however,the average daily growth rate of stem sap flow in the control group was higher than in the throughfall reduction group.3)The sap flow rate of Pinus sylvestris var.mongolica increased first and then decreased during the growing season,and it was higher in summer than in spring and autumn.4)The sap flow rate of Pinus sylvestris var.mongolica was positively correlated with photosynthetically active radiation and air temperature,but negatively correlated with air relative humidity.Hence,the sap flow rate of Pinus sylvestris var.mongolica increased under the scenario of throughfall reduction,and it provides a scientific reference for the plantation management in the future.

Key words: northwestern Liaoning, Pinus sylvestris var.mongolicain in sandy area, sap flow, throughfall reduction, environmental factor

CLC Number:

S718

SHI Zheyu, LI Zihao. Effect of Throughfall Reduction on Sap Flow of Pinus sylvestris var.mongolica in Sandy Land of Northwest Liaoning[J]. Forest and Grassland Resources Research, 2023, (6): 137-145.

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References 36

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处理	胸径/cm	树高/m	边材长度/cm	边材面积/cm²	冠幅/m²
对照(CK)	31.4	18.5	12.4	263.729	6.5×5.7
减雨(TR)	29.2	17.5	10.2	231.073	7.0×7.0

环境因子	晴天		阴天		雨天
环境因子	对照	减雨	对照	减雨	对照	减雨
空气温度	0.919^**	0.913^**	0.766^**	0.844^**	0.877^**	0.857^**
空气湿度	-0.812^**	-0.821^**	-0.727^**	-0.778^**	-0.499^**	-0.592^**
饱和水汽压差	0.855^**	0.858^**	0.779^**	0.830^**	0.681^**	0.752^**
光和有效辐射值	0.773^**	0.812^**	0.638^**	0.740^**	0.695^**	0.769^**
5 cm土壤温度	0.435^**	0.393^**	0.672^**	0.606^**	0.416^**	0.309^*
10 cm土壤温度	0.179	0.136	0.380^**	0.28	0.248	0.136
20 cm土壤温度	-0.421^**	-0.458^**	-0.431^**	-0.547^**	0.340^*	-0.44^**
5 cm土壤含水量	-0.495^**	-0.495^**	0.061	0.073	-0.134	-0.027
10 cm土壤含水量	-0.261	-0.246	0.171	0.161	0.352^*	0.268
20 cm土壤含水量	—	—	-0.029	-0.014	—	—

环境因子	晴天		阴天		雨天
环境因子	对照	减雨	对照	减雨	对照	减雨
空气温度	0.926^**	0.945^**	0.628^**	0.614^**	0.372	0.253
空气湿度	-0.624^**	-0.617^**	-0.510^*	-0.490^*	-0.526^*	-0.485^*
饱和水汽压差	0.821^**	0.818^**	0.546^*	0.528^*	0.567^*	0.529^*
5 cm土壤温度	0.789^**	0.855^**	0.730^**	0.714^**	0.278	0.082
10 cm土壤温度	0.739^**	0.814^**	0.711^**	0.696^**	0.187	-0.013
20 cm土壤温度	-0.348	-0.460	-0.585^**	-0.568^**	-0.716^**	-0.831^**
5 cm土壤含水量	-0.854^**	-0.797^**	—	—	0.475^*	0.421
10 cm土壤含水量	—	—	-0.523^**	-0.493^*	—	—
20cm土壤含水量	—	—	0.243	0.233	—	—

环境因子	对照	减雨
空气温度	0.699^**	0.757^**
空气湿度	-0.831^**	-0.900^**
饱和水汽压差	0.835^**	0.901^**
光合有效辐射值	0.656^**	0.806^**
5cm土壤温度	0.223^**	0.191^**
10cm土壤温度	0.097^*	0.057
20cm土壤温度	-0.154^**	-0.183^**
5cm土壤含水量	-0.268^**	-0.245^**
10cm土壤含水量	-0.109^**	-0.117^**
20cm土壤含水量	-0.049	-0.068

环境因子	对照	减雨
空气温度	0.380^**	0.542^**
空气湿度	-0.356^**	-0.488^**
饱和水汽压差	0.507^**	0.67^**
光和有效辐射值	0.608^**	0.78^**
5 cm土壤温度	0.119^**	0.136^**
10 cm土壤温度	0.096^**	0.103^**
20 cm土壤温度	0.073^**	0.066^**
5 cm土壤含水量	-0.063^**	-0.091^**
10 cm土壤含水量	-0.075^**	-0.112^**
20 cm土壤含水量	-0.063^*	-0.108^**