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Ningxia University (2022)

MNPP Estimation and Forage-livestock Balance Characteristics of Temperate Grassland in Semi-arid Loess Hilly Region

宋小龙

Titre : MNPP Estimation and Forage-livestock Balance Characteristics of Temperate Grassland in Semi-arid Loess Hilly Region

Auteur : 宋小龙

Grade : Doctoral Dissertation 2022

Université : Ningxia University

Résumé partiel
Climate change and human activities have had an important impact on the grassland ecosystem in China,especially in the semi-arid ecologically fragile areas in China.As an important basic means of production for traditional animal husbandry,natural grassland is an important link in the ecological chain of grassland ecosystem.The estimation and prediction of its primary production is the key to determine the reasonable livestock carrying capacity.Yuanzhou district is the largest temperate grassland area in Ningxia.The typical semi-agricultural and semi pastoral area has been damaged to varying degrees since the 1930s.The policy of returning farmland to forest and grassland has been gradually implemented.The "grazing prohibition and house feeding" has become the main animal husbandry mode of the temperate grassland in the semi-arid loess hilly region.After more than 20 years of implementation of the grassland management measures of "returning farmland to forest and Grassland",the grassland ecological environment has been greatly improved.All grasslands have not been developed and utilized,and the cultivated land has been gradually withdrawn.The sources of livestock ration supply are shrinking day by day,and the phenomenon of people and livestock competing for food still exists for a long time.It is questionable to dynamically adjust the grassland management policies to alleviate the pressure of farmers’ livestock feeding on forage grass.It is particularly important to reevaluate the balance between grass and livestock on temperate grasslands,It is a scientific question that must be answered to dynamically adjust grassland management policies.On the premise that the State advocates the development of ecological animal husbandry,it is necessary to coordinate the rational allocation of all natural grassland and artificial grassland resources related to animal husbandry,so as to promote the healthy and sustainable development of modern ecological animal husbandry.By revealing the occurrence mechanism of influencing factors of forage-livestock balance,this study,taking 2020 as the time section,analyzes the influencing factors of primary production of temperate grassland,constructs a prediction and analysis model of grass yield and nutrition,analyzes the allocation characteristics of different forage resources and their yield per unit area and nutrition carrying capacity in typical villages,and finally realizes the scale transformation of forage-livestock balance relationship among counties,villages and farmers,So as to realize the identification of influencing factors of forage-livestock balance in the temperate grassland in the semi-arid loess hilly region,provide technical support for the rapid,accurate,efficient and nondestructive estimation of the livestock carrying capacity of the temperate grassland,and also provide scientific basis for the government to comprehensively formulate animal husbandry development policies and dynamically adjust grassland management policies.

Mots clés : Semi Arid Loess Hilly Region ;Temperate Grassland ;Grassland Primary Productivity ;Forage-livestock Balance ;Livestock Carrying Capacity ;

Présentation (CNKI)

Page publiée le 19 octobre 2022