不同平茬时间柠条林土壤水分、电导率、温度垂直动态特征  

Vertical Dynamic Characteristics of Soil Moisture,Conductivity and Temperature of Caragana korshinskii in Different Stubble Time

作　　者：温学飞[1] 李浩霞[1] 田英 Wen Xuefei;Li Haoxia;Tian Ying(Institute of Desertification Control,Ningxia Academy of Agriculture and Forestry Sciences,Yinchuan,Ningxia 750002;Ningxia Forestry Research Institute,Yinchuan 750004)

机构地区：[1]宁夏农林科学院荒漠化治理研究所,宁夏银川750002 [2]宁夏林业研究院,宁夏银川750004

出　　处：《宁夏农林科技》2021年第10期34-39,I0001,F0003,共8页Journal of Ningxia Agriculture and Forestry Science and Technology

基　　金：宁夏回族自治区农业科技自主创新专项(NKYG-19-02)、世界银行贷款宁夏黄河东岸防沙治沙项目(P121289)。

摘　　要：平茬是柠条林更新复壮的有效措施之一,深入研究柠条林生长季不同平茬时间土壤水分、温度、电导率垂直动态特征对于柠条林平茬时间的确定具有指导意义。本研究选择25年柠条林,在2017年生长季进行平茬,平茬时间为4—10月,于2018年柠条生长季每月中旬测定一次土壤水分、温度、电导率。结果表明:平茬柠条林土壤水分、电导率垂直动态特征明显,PC7、PC8处理随土层的加深土壤水分空间变异显著,7月、8月平茬可有效改变土壤水分垂直动态特征;同一监测时间下,PC7、PC8处理土壤水分显著高于其他处理。研究发现,PC7、PC8处理是土壤水分响应变化的拐点,生长季内土壤温度呈倒U型变化趋势,可参考作为平茬柠条优化管理的一个时间节点。Flat stubble is one of the effective measures for the regeneration and rejuvenation of Caragana korshinskii.In-depth study of the vertical dynamic characteristics of soil moisture,temperature and conductivity at different flat stubble time in the growth season of Caragana korshinskii is of guiding significance for determining the average stubble time of Caragana korshinskii.In this study,we selected 25-year Caragana korshinskii and carried out flat stubble in the 2017.The flat stubble time was from April to October,and soil moisture,temperature and conductivity were determined in the middle of each month.The distance from the root system under the Caragana korshinskii shrub was 30 cm away from the root system for different flat stubble times in 2018.The results showed that the soil moisture,conductivity and vertical dynamic characteristics of the flat stubble forest were obvious.PC7 and PC8 varied significantly with the deepening of the soil layer.The flat stubble in July and August could effectively change the vertical dynamic characteristics of soil moisture;In the same monitoring time,the soil moisture of PC7 and PC8 was significantly higher than other treatments.The study found that PC7 and PC8 treatments are the turning points of soil moisture response changes,and soil temperature changes as converse-U during growing period,which can be referred to as a time node for optimal management of Caragana korshinskii.

关 键 词：柠条 平茬时间 土壤水分 土壤温度 电导率 

分 类 号：S793.3[农业科学—林木遗传育种]