Study On Adaptability Of Switchgrass In Saline-alkali Land Of Ningxia Yinbei Region

Under the condition of the development of new energy and the construction of ecological civilization,it is of great significance to develop and utilize saline-alkali resources to cultivate biomass energy plants for regional ecological environment construction and sustainable development.High-quality energy crops have strong resistance to switchgrass and can be planted in saline-alkali soil,but the ecological adaptability of different switchgrass varieties in Northwest saline needs further exploration.Therefore,in this experiment,the growth adaptability,pHysiological adaptability,nutrient utilization efficiency and soil environmental effects of different switchgrass cultivars were studied under the condition of typical saline-alkali land in the north of Switchgrass,in order to ascertain the ecological adaptability of switchgrass in northwest saline of China,Provide theoretical and technical support for saline-alkali switchgrass planting.The test results show that:(1)The different varieties of switchgrass in the north saline-alkali land of Ningxia can be wintering normally,the number of childbearing days is 135-156 days,and the growth adaptation to A,C,K variety switchgrass best;F,J variety growth adaptability is good;B,P,N-28,C,J,An,T variety switchgrass growth adaptability is poor.(2)The photosynthetic ability of switchgrass is the strongest with different varieties of switchgrass in saline-alkali land.F,B,P,N-28,An,T variety Switchgrass photosynthetic ability is strong;NY varieties have poor photosynthetic ability;C,J,K variety Switchgrass photosynthetic ability is the worst.(3)Different varieties of switchgrass were planted in saline-alkali land with NY varieties switchgrass the strongest physiological resistance to adversity;N-28,C,F variety switchgrass physiological stress resistance moderate;P,B,J,An,T,K,A breed switchgrass the lowest physiological resistance to adversity.(4)The nitrogen,phosp horus and potassium contents of different cultivars of switchgrass plant were potassium,nitrogen and phosp horus.C Variety Switchgrass phosp horus utilization efficiency is highest,nitrogen utilization efficiency is second only to B variety switchgrass,the utilization efficiency of potassium is low;The utilization efficiency of switchgrass phosphate was higher,the utilization efficiency of n was lower and the utilization efficiency of potassium was lower.The utilization efficiency of P,J and K varieties Switchgrass was lower.The utilization efficiency of N-28,NY,F,B and a switchgrass were higher,the utilization efficiency of phosp horus was moderate and the utilization efficiency of potassium was high.(5)Planting switchgrass in saline-alkali land can effectively reduce the content of soil ions,among which the content of K+,Na+,Cl-,HCO3-,CO32-,SO42-and Mg2+ ions are obviously decreasing,and the treatment of Ga2+ is increased.Generally speaking,the soil ionic content of C variety Switchgrass was the most obvious in different varieties of saline-alkali soils.The content of soil ions in T and an species decreased obviously.The soil ions in K,J and p varieties decreased less;The soil ion content of N-28,NY,F,B and A was decreased.(6)Planting switchgrass in saline-alkali soil can effectively reduce the total salt content and pH value,and the content of soil organic matter,total nitrogen,alkali solution nitrogen,available potassium and available phospHorus are increasing.Generally speaking,the soil environmental improvement ability is most obvious in the saline-alkali planting switchgrass of An,N-28,J and A;The improved ability of P and NY varieties to improve soil environment was obvious,and F and K varieties had poorer soil improvement ability.B,C,T varieties have the worst ability to improve soil environment.(7)The results showed that the adaptability of switchgrass wasN-28>NY>N>Y>A>C>P>T>J>B>K>F>An?...