The Research Of The Nebkha Soil Nutrient At Transitional Zone Between Oasis And Desert

Nabkha is a common kind of biological wind deposition geomorphy in arid and semi-humid desert, and sandy coast. The desertification soil nutrient change is in the desertification process in the energy flow, the physical distribution important link, the soil nutrient change direct influence desertification degree and the development. In the soil - plant system, the soil change which the research plant causes, to understand the system nutrient tendency, plants'site-specific competition and vegetation's management and so on has the vital role. Under desert landscape, brush"fertile island"the formation and the organic matter are the bush plant adapt to the barren sand nature circumstances in the rhizosphere deposition main machine-made and the effective use nutrient main countermeasure, simultaneously under the brush the nutrient accumulates the degree and the rhizosphere nutrition dynamic may reflect the different bush type to the nutrient use condition and to the soil fertility protection effect. Studies the different brush plant to the soil nutrient accumulation and the nutrient in rhizosphere microzonality environment characteristic and the tendency, to promulgates the brush to the system in the soil nutrient protection and the effective use mechanism, as well as vegetation's succession and restores the reconstruction and so on all to have the important ecology significanceThis article fills (grass) take the Xinjiang Hetian River basin model Nabkha as the object of study, take discipline theories and so on the soil science, phytogeography, plant ecology as the instruction, in desert center Hetian River both banks, and the field oasis and the desert intermediate belt, each kind of sand piled the surface layer altogether to gather approximately 500 deposit samples. meanwhile, collected about 300 oasis farmland wandering dune to make a comparation. In the open country inspection foundation, union test analysis methods and so on deposit nutrient determination, granularity experiment, studying the Hetian River basin Nabkha the soil nutrient change characteristic. Nabkha is opposite Nabkha and the brush (grass) the outside nutrient concentrates coefficient (E) in other brushes to attribute in the Chinese tamarisk brush as the weight target the fat island effect strong and the weak and the change. Data gains which to the laboratory experiment; use classical statistics principle and method, utilization statistics software SPSS13.0, extraction correlation parameter, research parameter change rule. Through the contrast analysis different vegetation type, the different spot brush sand piles, summarizes the Hetian River basin b Nabkha the soil nutrient characteristic, and unifies Nabkha the soil granularity result, obtains the Hetian River basin Nabkha the soil nutrient characteristic initially the origin mechanism.The basic conclusion is as follows:The Hetian River basin Nabkha, piles the different spot nutrient content in the sand to have varying degree concentrating. But each spot concentrates the degree to have the big difference.Hetian River basin Chinese tamarisk sand pile and the camel thorn sand piles the soil nutrient to pile the crown in the sand the average content is higher than against the wind the slope and the leeward slope, but the reed sand piles the soil nutrient is against the wind high in the slope average content, this result which analyzes with the granularity experiment consistent.According to the laboratory determination obtained data analysis and the open country inspection and the sampling result, differently Nabkha the nutrient in the Hetian River basin wind power corrosion and the transporting as well as the plant to the soil surface layer nutrient content and the brush to concentrate has the very tremendous influence.