Suitablility Of Three Plants Under Different Canopy Density

Underforests planting is one of the important patterns in agroforestry.In order to development underforests planting,and explore underforests cultivation technique,through this test in different canopy density of woodland?0.4-T4?0.5-T5?0.6-T6?0.7-T7?0.8-T8?set up the sample area,planting 3 undergrowth,adding controls set the original woodland?T0?and the cultivated woodland?Tz?to explore different canopy density on the3 kinds of understory plant growth,the differences between the photosynthetic physiological and element accumulation and forests growing influence on woodland soil nutrient and microorganism,aims to forests growing support for scientific and reasonable.The main results of this study are as follows:?1?Different canopy density had a significant effect on the growth index of 3 species of forest.The biomass of the Sarcandra glabra and Aspidistra elatior is the largest in the treatment of T7.The biomass of the Alpinia oxyphylla is the largest when dealing with T5.?2?The effects of different canopy density on photosynthetic physiology of 3 species of forest are prominent.On the whole,the photosynthetic parameters of the Sarcandra glabra under T7 are ideal,and the P_max is 7.67?mol·m^-2·s^-1;The LSP is1075.17?mol·m^-2·s^-1;The LCP is 4.6?mol·m^-2·s^-1,and the R_d is?mol·m^-2·s^-1.For the Alpinia oxyphylla test T5 is suitable.The P_max is 6.78?mol·m^-2·s^-1,the LSP and the LCP are 930.96?mol·m^-2·s^-1,and 7.63?mol·m^-2·s^-1,and the R_d is 0.63?mol·m^-2·s^-1.In the test T7 for the Aspidistra elatior have suitable photosynthetic parameter.The P_max is 4.14?mol·m^-2·s^-1,and the LSP,LCP,and R_d are 826.38?mol·m^-2·s^-1,5.14?mol·m^-2·s^-1,and0.19?mol·m^-2·s^-1.?3?The influence of different canopy density on the nutrient content of 3 species of plants.Among them,the content of Sarcandra glabra N,P and K reached the highest level in test T4,T5 and T4 respectively,and the contents of Alpinia oxyphylla N,P and K reached the highest level under the treatment of T6,T7 and T5 respectively.The content of Aspidistra elatior,N,P and K is the highest in test T5,T4 and T5 respectively.?4?The effect of plantation on soil physical and chemical properties and soil enzymatic activity of forest land was very significant?P<0.01?.On the basis of the test 5samples,the original woodland T0 and the soil preparation woodland Tz are selected as the control group.The highest pH is T0,the lowest is Tz;The organic matter content is the highest T7,the lowest is T0;The maximum total phosphorus content is T5,the lowest is Tz;The highest effective p content T7,the lowest is Tz;The highest potassium content is T5,the lowest is T6;The highest potassium content is T5,the lowest is T7;Ammonium nitrogen is the highest T4 and the lowest is T0;The nitrate nitrogen is T6 and the lowest is T5;The total nitrogen is Tz and the lowest is T0;The highest nitrogen solution is Tz and the lowest is T0.The soil moisture content is T0,the lowest is T5;The maximum amount of water in the field is T5 and the lowest is T8.The activity of catalase was the highest and the lowest.Acid phosphatase the highest Tz,the lowest is T0;Urease is the highest T6,and the lowest is T0,and the soil physicochemical properties and enzymatic activity of the forest are significantly affected by planting under the forest.?5?Underforests planting on soil microbial abundance and abundance effect significantly,to forests grow can significantly alter soil microbial distribution belong,and different soil bacteria abundance and community structure differences between crown density significantly,the original forest soil bacteria abundance and community structure and other processing is bigger,the distance between the obvious difference between the treatment group.To sum up,Sarcandra glabra and Aspidistra elatior are suitable for planting in crown density 0.7 forests,Alpinia oxyphylla is suitable for planting in crown density 0.5 forests,the understory planting can significantly improve soil physical and chemical properties,nutrient,strengthen soil enzyme activity and the changing structure of soil microbial abundance and community.