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Inner Mongolia Agricultural University (2017)

The Influence That Management of Understory Vegetation in Semiarid Region Has in Soil Moisture of Secondary Deciduous Broadleaved Forest

周婕

Titre : The Influence That Management of Understory Vegetation in Semiarid Region Has in Soil Moisture of Secondary Deciduous Broadleaved Forest

Auteur : 周婕

Grade : Master’s Theses 2017

Université : Inner Mongolia Agricultural University

Résumé
Under the background of global warming,the problem that the trees in the world are dying becomes increasingly prominent.With natural forest conservation program in China coming into effect.But in semiarid area,the problems that brushwood grow too fast and even absorb the water and fertilize that forests need are becoming more serious,which prevents the tree species from growing healthily to a large extent.However,the Daxinganling region has vast area and this research area is located in Saihanwula Ecological Station,the epitome of Daxinganling region.Therefore,the research puts up the scientific problem about whether controlling the growing of brushwood in semiarid area artificially can increase the ability of forest to resist climatic arid and reduce the death rate of forest.Researching the influence that management of understory vegetation in arid and semiarid region has in soil moisture of secondary deciduous broadleaved forest will contribute to the building of forest ecological balance system,thus providing theoretical basis for how to manage and solve the problems of forest ecological balance system reasonably and effectively.The main results of the research are as follows:1.The root system distribution in research area mainly concentrates on the soil layer about 0-20cm.And as the depth of soil layer goes deeper,the root distributed reduces gradually.The Ⅳ and Ⅴ rainfall events in test duration which contribute to the soil moisture content of all layers.Because the rain capacity of small rainfall events,the Ⅰ、Ⅱ、Ⅲ rainfall events are barely any effects on the soil moisture content of all layer.Divide them into three layers---the rapid change layer,the active layer and stable laye.2.The shrubs and herbs in the ground have an interception effect on the rainwater in a rainstorm.After rainfall,the soil water storage capacity increases the most for the control plants,and the soil water storage capacity increases can be ordered from big to small:All-cut>cutting bush>mowing>comparison,Soil water storage loss after the rain can be ordered from big to small:All-cut>cutting bush>mowing>comparison.3.After the rain,the soil water loss rate is minimized is all cut and cutting bush.After a small-scale rainfall event in August and a large-scale rainfall event in September,the loss rate of soil water storage capacity from big to small:comparison>mowing>cutting bush>All-cut.4.After a large-scale rainfall event in September,all the shrubs were most responsive to rainfall.The response of soil water content to rainfall in different management modes was concentrated in 0-30cm soil layer,30-50cm The three management methods in the soil layer have little effect on the increase of soil water content after rainfal

Mots clés : Soil moisture; Management of understory vegetation; Root system; Precipitation;

Présentation (CNKI)

Page publiée le 30 janvier 2018