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Ningxia University (2021)

Study on the Adaptive Growth of Kochia Scoparia in Response Relationship to the Rainfall and Density in the Arid Zone of Central Ningxia

高海燕

Titre : Study on the Adaptive Growth of Kochia Scoparia in Response Relationship to the Rainfall and Density in the Arid Zone of Central Ningxia

Auteur : 高海燕

Grade : Master 2021

Université : Ningxia University

Résumé partiel
This paper aims at the issue of the unclear mechanism of the seasonal vegetation growth adaptability affected by rainfall in the ecologically fragile areas of central Ningxia.Taking seasonal vegetation Kochia scoparia as an example,through outdoor barrel planting experiments,under different rainfall and different planting densities,seed germination rate,survival rate,growth characteristics(plant height,stem),physiological characteristics(microstructure,stomata opening,stomata density,photosynthetic rate),Law of water consumption(transpiration of Kochia scoparia leaf surface and soil evaporation),and changes in soil salt content and other angles,the effects of different hydrological years’ rainfall and planting densities on the growth of seasonal vegetation Kochia and the salt content of the soil layer were analyzed.Clarified the response relationship between seasonal vegetation growth and rainfall and planting density in ecologically fragile areas in the arid zone of central Ningxia,Clarified the best improvement effect of rainfall and planting densities on soil and vegetation in arid areas of Ningxia,and established the vegetation biomass modeles.Mainly get the following conclusions :(1)Extreme drought stress(extremely low water years)has a significant inhibitory effect on the germination rate,germination index and vitality index of Kochia scoparia seeds.The general trend of the germination process of Kochia scoparia seeds is to germinate slowly first,and then the germination rate increases until it becomes stable in batches.The rainfall in dry years and extremely dry years has a greater inhibitory effect on the seed germination process than the rainfall in wet years and extremely high water years in promoting the process of seed germination.

Mots clés : Arid zone in central Ningxia ;Kochia scoparia ;Rainfall;Density ;Adaptive growth ;

Présentation (CNKI)

Page publiée le 20 février 2022