Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Responses of Vegetation Productivity and Soil Characteristics to Mowing and Mulching in Desert Steppe

Auteur : 罗叙

Grade : Master 2022

Université : Ningxia University

Résumé partiel
Mowing and grazing are regarded as two effective measures of grassland management.Irrational grazing directly affects the health and sustainable development of grassland.How to establish a scientific and reasonable grassland management system,protect and restore the inherent structure and function of grassland is of great significance to the ecological service function and social value of grassland.This study takes the temperate desert grassland in Yanchi County,Ningxia Province,the southern edge of Mu Us Sandy Land as the research object,Three mowing treatments were designed of mowing removal（A）,mowing in situ mulching（B）and mowing in situ mulching and adding mulching（C）and three mowing frequencies of once a year（Al,B1,C1）,twice a year（A2,B2,C2）and three times a year（A3,B3,C3）,the added mulching came from A.In vegetation and soil,on the basis of comprehensive survey,carried out under different mowing frequency and cover processing desert grassland plant community structure,herbage nutrient,soil physical and chemical properties,soil carbon flux and grassland productivity pattern,relative feeding value and crude protein yield research,in order to provide decision-making basis for the use of fenced grassland,provide theory basis for ecosystem services.The main results are as follows.（1）Mowing and mulching increased aboveground biomass in desert steppe and showed an increasing trend with the increase of mowing frequency.A1 treatment was beneficial to the increase of plant community density.At the same cutting frequency,Shannon-Wiener diversity index of B2 and C2 was higher than that of A,and C1 was beneficial to the increase of Margalef index.There was a positive correlation between aboveground biomass and community a diversity.The compensatory index of B3 and C3 was significantly different from that of A1（P＜0.05）.（2）Cutting increased the contents of crude protein,crude fat and dry matter,and the higher the cutting frequency,the higher the content of crude protein.Under the same cutting frequency,increasing vegetation coverage was not conducive to the increase of crude protein content.Both high frequency cutting and addition coverage were significant（P＜0.05）decreased plant community acidity and neutral detergent fiber,A3 and B3 significantly（P＜0.05）increased the relative feeding value of plant communities.There was a positive correlation between crude protein and ash,crude fat and relative feeding value（P＜0.001）,and dry matter（P＜0.01）,neutral and acid detergent fibers（P＜0.001）were negatively correlated.

Mots clés : desert steppe ;mowing and mulching ;community productivity ;forage nutrient ;soil physical and chemical properties ;

Présentation (CNKI)