| Different materials were carried out on the I-107 poplar plantation.Analyzed soil water content, soil maximum capillary cpacity and soil saturated water content, soil physical characteristic, growth quantity condition of I-107 poplar plantation. Used Logistic curve equation to express and inspect the height, dbh, and individual volume of I-107 poplar plantation. Measures on the I-107 poplar plantation static and dynamic economic analysis in different water retention covering.The research were as follows:1. The minimum soil water content was on June 7 of 0-20cm depth in different water retention covering. Black veil mulch was more than 58% compared with contrast. Soil with water absorbing resin and black veil dual mulch were more than 20% compared with black veil mulch ,more than 89% compared with contrast. Soil with water absorbing resin and wheatstraw and black veil multiple treatments were more than 5% compared with soil with water absorbing resin and black veil dual mulch, more than 25% compared with black veil dual mulch, more than 98% compared with contrast.The effective of different water retention covering were soil with water absorbing resin and wheatstraw and black veil multiple treatments > soil with water absorbing resin and wheatstraw and white veil multiple treatments > soil with water absorbing resin and black veil dual mulch > soil with water absorbing resin and white veil dual mulch > black veil and wheatstraw dual mulch > white veil and wheatstraw dual mulch > soil with water absorbing resin and wheatstraw dual mulch >black veil mulch>white veil mulch>wheatstraw mulch>soil with water absorbing resin >contrast. Multiple treatments were better than dual treatments, and more than single treatments.2. Compared with the first year,soil maximum capillary cpacity of soil with water absorbing resin and wheatstraw and black veil multiple has growed 35.97%, soil with water absorbing resin and wheatstraw and white veil multiple 35.75%. Soil with water absorbing resin and wheatstraw dual mulch has growed 34.09%, black veil and wheatstraw dual mulch 34.17%, white veil and wheatstraw dual mulch 33.98%, soil with water absorbing resin and black veil dual mulch 30.64%, soil with water absorbing resin and white veil mulch 31.63%. Black veil mulch has growed 28.24%, white veil mulch 27.21%, wheatstraw mulch 27.13%, soil with water absorbing resin 28.28%, contrast 27.13%. From the second year to fourth year,soil saturated water content grow fastly, about 47% of value added. Analysis of variance soil maximum capillary cpacity and saturated soil water content was Sig.=0.000<0.05.3. Soil bulk density reduced about 60%-70.66% from the first year to fourth year. Compared with contrast, soil with water absorbing resin and wheatstraw and black veil multiple of soil bulk density in the 7th year has reduced 12.50%, soil with water absorbing resin and wheatstraw and white veil multiple 11.72%, black veil and wheatstraw dual mulch 10.16%, white veil and wheatstraw dual mulch 10.16%, soil with water absorbing resin and black veil dual mulch 9.37, soil with water absorbing resin and white veil mulch 7.03%, soil with water absorbing resin and wheatstraw dual mulch 7.81%, black veil mulch 4.69%, white veil mulch 3.91%, wheatstraw mulch 4.69%. Soil porosity has increased in different water retention covering. Soil with water absorbing resin and wheatstraw and black veil multiple has increased 5.40%, soil with water absorbing resin and wheatstraw and white veil multiple 5.42%, soil with water absorbing resin and wheatstraw dual mulch 5.35%, black veil and wheatstraw dual mulch 5.36%, white veil and wheatstraw dual mulch 5.34%, soil with water absorbing resin and black veil dual mulch 5.33%, soil with water absorbing resin and white veil mulch 5.26%, black veil mulch 5.24%, white veil mulch 5.24%, wheatstraw mulch 5.20%, soil with water absorbing resin 5.19%, contrast 5.07%. Analysis of variance soill soil bulk density and soil porosity was Sig.=0.000<0.01.4. The tree height has growed about 53%-56% from the first year to fourth year. The tree dbh has growed about 72% from the second year to 5th year. The tree individual volume has growed about 73% from the third year to 6th year.Height increment apparent differently from the fourth year. The maximum tree height was in the fourth year. The maximum tree dbh was in the 5th year. The effective in promoting the growth of different water retention covering were multiple treatments > dual treatments > single treatments > contrast. Twelve different water retention coverings has divided into 4 classes: multiple treatments, dual treatments, single treatments, contrast. Analysis of variance them was Sig.=0.001<0.05.5. Dynamic prediction model R2 of height, dbh, individual volume were more than 0.96 in different water retention covering. High point of height was the second year or third year, starting point of high-speed was the first year, and the end point of high-speed was the fourth year or 5th year. High point of dbh was the third year or fourth year, starting point of high-speed was the first year or second year, and the end point of high-speed was the 5th year or 6th year. High point of individual volume was the fourth year or 5th year, starting point of high-speed was the third year, and the end point of high-speed was the 6th year or 7th year.6. T value of measured and simulation on height in different water retention covering was between 0.362 and 0.980, on dbh was between 0.168 and 0.837, on individual volume was between 0.120 and 0.634. Then were more than 0.05.7. Input-output analysis of different water retention covering were soil with water absorbing resin and white veil dual mulch > soil with water absorbing resin and black veil dual mulch >white veil mulch>black veil mulch > soil with water absorbing resin and wheatstraw and black veil multiple treatments > soil with water absorbing resin and wheatstraw and white veil multiple treatments > soil with water absorbing resin > white veil and wheatstraw dual mulch> black veil and wheatstraw dual mulch > soil with water absorbing resin and wheatstraw dual mulch > wheatstraw mulch> contrast.Annual profit were more than 12645.56 element per hectare each year. Profit margin of capital were more than 376.66 element based on 100 element.Net present value ratio were more than 3.77, between 4.76 and 5.67.
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