Study On The Stability Of Hippophae RhamnoidesLinn.Cv From Russia

Hippophae rhamnoidesLinn.cv is the single advantage community, and its stability has become the primary problem to the researchers in this field. This article chose Hippophae rhamnoidesLinn.cv at Dahekou forest farm in Sunwu country, Heilongjiang province as the research object. On the basis of analysis of population structure and spatial pattern, the study focused on Hippophae rhamnoidesLinn.cv at different developmental stages and habitat conditions, including changing process and regular of soil moisture and nutrients, factors of population internal stability, distribution pattern and spatial association of different age class individual. In order to reveal the growth characteristics, biological communities, variation of biomass, and describe population stability. Explore grow habitat stability of Hippophae rhamnoidesLinn.cv community. The research results could provide theoretical basis for plantation stable construction. And then completed forest management, afforestation design and population ecology restoration of study areas. Ultimately, provided theoretical basis for natural regeneration and vegetation communities natural restoration of Hippophae rhamnoidesLinn.cv and ecological construction. The results were as follows:1) Average tree height, average crown diameter, canopy density, soil water content, different habitats and soil properties of Hippophae rhamnoidesLinn.cv at different developmental stages showed:born for llyears>born for 7years>born for 2years> abandoned land. Hippophae rhamnoidesLinn.cv had an improved effect on soil. And the improved effect was more obvious as the age of stand increased. Improved effect of Hippophae rhamnoidesLinn.cv born for llyears was the most obvious. Improved effect of Hippophae rhamnoidesLinn.cv born for 2years was not obvious because of short plant period. Besides, the flatlands and lowlands were better than rolling hill in soil chemical properties. Soil physical and chemical properties of flatlands was best, followed by lowlands. Lowlands were in the water for a long time. Excessive water made the soil pH low and meta-acid.2) Physiological integration consumption-benefit analysis showed that keeping rhizomes connection significantly improved the diameter and tree height growth of plants (stock plants and sub-plants) suffering shading treatment. Especially, it improved the survival rate of plants suffering shading treatment. Total increment of diameter and tree height consumption-benefit analysis showed that plants without shading treatment didn’t consume significantly. But plants suffering shading treatment got benefits significantly. These results verified the findings of Slade and Hutching. In addition, the existence of physiological integration could help Hippophae rhamnoidesLinn.cv plantation stand a certain degree of adverse environment and consolidate its stability.3) Study on different diameter classes individual number and age of Hippophae rhamnoidesLinn.cv. The results showed that the proportion of small diameter class individuals presented a large small-large trend with the increase of age class. And the proportion of large diameter class individuals presented an increasing trend step by step. As the age increased, population overall diameter class in the studied area showed an increasing trend and was in a growth phase. Hippophae rhamnoidesLinn.cv population named 11a presented abnormal distribution. The number of young seedlings and large diameter class individuals was larger, and middle-class individuals was fewer. It illustrated that population slowed down its growth rate through intraspecific competition. Hippophae rhamnoidesLinn.cv population presented a trend of stability-recession-stability.4) Study on spatial patterns distribution of Hippophae rhamnoidesLinn.cv single population showed that the entire population was obviously clumped distribution. And when the scale was 1 m, it clumped for maximum. When diameter class was 1,2,5, it was obviously clumped distribution in the scale. When diameter class was 3, it was clumped distribution less than 19 m and random distribution more than 19 m. When diameter class was 4, it was clumped distribution less than 7 m and random distribution more than 13 m. Particularly, it was clumped distribution and random distribution when the scale was between 7 m and 13 m, but preferred to random distribution.5) In order to express intuitively growth process of average diameter and average tree height, this study completed equation fitting for Hippophae rhamnoidesLinn.cv growth process of average diameter and average tree height by the statistical software SPSS 13.0. S-type function was the optimal model for the growth process of average diameter. Fitting variance R was 0.998 for maximum and fitting equation was Y= e x (2.2458-3.768/X) Cubic function was the optimal model for the growth process of average tree height. Fitting variance R2 was 0.980 for maximum and fitting equation was Y=-0.5205+0.9076X-0.1128X2+0.0046X3.6) This study was based on vegetation index remote sensing solution of field survey sample areas. Remote sensing vegetation index and regression analysis of measured samples Hippophae rhamnoidesLinn.cv biomass were established. According to quantitative inversion of research area biomass, explored spatial pattern distribution. Precision of multiple regression remote sensing vegetation index model was higher. Remote sensing model of this biomass was as follow:y=-5.651+2.656RVI+12.056NDVI+0.169DVI+6.591TNDVI, R2=0.909. The results indicated that there was a good correlation between predicted value and theoretical value. But predicted biomass based on remote sensing index model was higher than the theoretical biomass.7) According to dynamic study of Hippophae rhamnoidesLinn.cv dominant population number, diameter class structure distribution of different developmental stages and geographical slopes was closely inverted J glyph which was able to achieve natural regeneration of Hippophae rhamnoidesLinn.cv plantation because of self-renewal and strong ability to clone. Natural degree and evenness index of Hippophae rhamnoidesLinn.cv plantation in the semi-sunny slope and semi-cloudy slope were higher than other slopes. Each species distributed unevenly in the semi-cloudy slope, but niche overlap was relatively high. Competition was intense and stability was poor.8) From gray relation analysis of different populations soil nutrition content and growth conditions on the ground, we got soil fertility compare of different age-classes and terrains. Hippophae rhamnoidesLinn.cv soil fertility of flatlands 11a was higher than lowlands 7a whose soil was barren relatively. At the same site conditions, the orders of Hippophae rhamnoidesLinn.cv plantation growth conditions were as follow:born for llyears>born for 7years>born for 2years. The orders of different stands growth conditions relation were as follow:flatlands 11a>rolling hill 11a>flatlands 7a>lowlands 7a>rolling hill 7a>> lowlands 11a. That is, relation of flatlands 11a was the highest and the one of lowlands 11a was the lowest.