Three Plants Leaf Litter Decomposition Characteristics Research In Tarim Basin

In this paper advantage of the southern border area of desert vegetation species Populus,Tamarix ramosissima, Glycyrrhiza inflata for the study, Using litter bag method, specifically in three plant species in different habitats(dry habitats- habitat â… , saline environment-Habitat â…¡) decomposition characteristics, Nutrient release process, discuss the main factors affecting litter decomposition, The results showed that:1. Three kinds of plant litter decomposition after 360 days,Populus leaves residual rate for Habitat â… 79.03%, habitat â…¡84.3%, inflation rate of Glycyrrhiza remaining habitats â… 59.7%, habitat â…¡ 81.13%, respectively ramosissima Habitat â…  88.03%, habitat â…¡ 86.64%,The decomposition rates of different habitats were different, and the high temperature and high humidity in summer was faster than that in winter.2. Two kinds of habitats, Populus euphratica litter decomposition constants respectively is 0.2353, 0.1710, Glycyrrhiza inflata litter decomposition constants respectively 0.5158 and0.2126. Tamarix ramosissima litter decomposition constants respectively, 0.1269 0.1520.Poplar litter decomposition of t0.5 were 2.95 a and 4.12 a, t0.95 were 12.75 a, 17.80 a. The results of the decomposition of the root litter decomposition of 50% of the time were 1.34 a,3.62 a, 95% of the time is 5.81 a, 15.66 a. The 50% litter decomposition of tamarixramosissima habitat time were 5.56 a and 4.69 a, 95% of the time is 24.024 a and 20.28 a respectively.3. There were significant differences in n elements in leaf litter initial, Tamarix ramosissima content maximum, licorice times, Populus euphratica at least; content of Populus euphratica leaf litter habitat i n and C maximum, and P, K and C / N instead. Glycyrrhiza inflata leaf litter in the initial P element content is the smallest, and habitat I was the lowest,only 075g/kg, P elements in Populus euphratica leaf litter is 2.59 times of Glycyrrhiza inflata.The initial content of K element exhibits ramosissima maximum, minimum Populus.4.Dynamic changes of the chemical composition of litter decomposition with different periods exhibit different degrees of Release of the three plants in two habitats through 360 d of decomposition: Populus leaf litter N residues, respectively Habitat â…  56.3%> Habitat â…¡45.73%, respectively, the amount of residual phosphorus habitats â…°47.7%, habitat â…±4006%, the residual amount of potassium respectively 56.85%, 56.04%, the amount of residual organic carbon 59.26%, 87.8% respectively;. Glycyrrhiza inflata leaf litter nitrogen remaining amount was respectively 46.2%, 48.45%, respectively, phosphorus Habitat â…°65.0%, habitatâ…± 64.6%. Residual amount of potassium, respectively, Habitat â…  45.88% <habitats â…¡83.67%, the amount of residual organic carbon, respectively, Habitat â… 59.37%, habitat â…¡72.25%; ramosissima in the absolute amount of residual nitrogen are two habitats to 79.21%,75.01%, the amount of residual phosphorus habitats â…±62.4%, habitat â…°78.2%, the residual amount of potassium show habitat â…°75.7%> Habitat â…±69.79%. Residual amount of organic carbon in descending order of Habitat â…¡80.85%, habitat â… 78.71%.5.Increased soil temperature and humidity can accelerate decomposition of litter, three kinds of plant litter decomposition rate and soil temperature is proportional, within a certain range, the higher the soil temperature, the faster the rate of litter decomposition. Populus leaf litter in habitat â…  decomposition rate and soil moisture was directly proportional to litter decomposition rate with increasing soil moisture and accelerated in habitat â…¡, three species of leaf litter decomposition rate and the soil moisture was proportional.6.Three kinds of leaf litter large differences in the two main chemical soil habitats.Wherein the soil habitat and habitat â…  â…¡ in the pH, total salt content and organic matter in the most obvious differences are show habitat â… > Habitat â…¡. Two habitats, the dynamic changes of the difference of soil nitrogen, phosphorus and potassium, the same habitat,surface soil total nitrogen content variation inconsistent.7. In the two habitats, soil surface activity seasonal dynamics significantly different,catalase and sucrose enzyme activity performance during the two habitats Habitat â…  >Habitat â…¡, two habitats, soil alkaline phosphatase activity annual average order size for Habitat â…±> habitat â…°, Tamarix ramosissima and vice versa. In habitat â… , the soil is too catalase activity and litter decomposition and oxidation amount was positively correlated with the habitat â…¡ soil catalase activity and litter decomposition was negatively correlated two habitats, soil invertase and base the amount of decomposition of litter and phosphatase activity was positively correlated with the amount of litter decomposition in surface soil alkaline phosphatase activity increased quickly.