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Xinjiang Agricultural University (2005)

Study on Space-time Variation of Dustfall and the Relationship between Dustfall and Aeolian Erosion in Tarim Basin

Zhao Dan Dan

Titre : Study on Space-time Variation of Dustfall and the Relationship between Dustfall and Aeolian Erosion in Tarim Basin

Auteur : Zhao Dan Dan

Grade : Master 2005

Université : Xinjiang Agricultural University

Résumé
Karst rocky desertification as a serious ecological problems of environmental degradation, are gradually being widespread concern in society. With the depth of karst rocky desertification control to carry out, Desertification Region, will produce a large area of ??artificial ecological economic forest. Special karst environment in Karst Areas of plantation site nutrition background, community structure, community nutrient distribution communities in nutrient cycling characteristics and other site conditions in plantations, in this article from 1 to 10 The years old dingtanensis example, use of karst rocky desertification area soil per plant nutrients discontinuity caused independent features, a monoclonal constitute circulatory system unit of karst rocky desertification area plantation community ecosystem structure, biomass allocation and nutrient distribution, accumulation and use of a systematic study of nutrient cycling, more scientific guidance karst rocky desertification area plantation management, especially to develop nutrient management measures to provide a basis for The main findings are as follows : the artificial community structure dingtanensis is relatively simple, mainly composed by dingtanensis, understory vegetation, litter of three parts, the species in a single, simple structure level community composition, seasonal changes are particularly evident. Top growth condition by slope position, slope, and held the amount of soil and soil depth significantly affected. By human interference, dingtanensis community biomass is mainly concentrated in the dingtanensis little understory vegetation proportion, litter tended to increase with the pepper age growth ; the organ biomass allocation dingtanensis proportion top age of altar pepper and related to the growth and development stage. Recommended mowing of understory vegetation artificial control for the protection of the understory vegetation. Average of Zanthoxylum woodland soil pH of 7.7, is a typical calcareous soil, a large number of elements of the forest soil total and available content of Ca gt ; Mg gt ; K gt ; the N gt ; P Content of trace elements Fe gt ; Mn gt ; Zn gt ; Cu soil parent material, pH value, calcium carbonate and bicarbonate, organic matter, soil physical properties and other factors the impact dingtanensis woodland soil trace elements available content Mn gt ; Fe gt ; Cu gt ; Zn, efficiency of Cu gt ; Mn gt ; Zn gt ; Fe. Of Zanthoxylum woodland litter material a large number of elements in an average of the levels of Ca gt ; N gt ; K gt ; Mg gt ; P ; trace elements Fe gt ; Mn gt ; Zn gt ; of Cu. The understory vegetation plant dingtanensis content of a large number of elements K gt ; Ca gt ; N gt ; Mg gt ; P ; trace element content of Fe gt ; of Mn gt ; Zn gt ; Cu. Gt the large element content the dingtanensis plant Ca ; N gt ; K gt ; P gt ; Mg ; trace element content of Fe gt ; Mn gt ; of Cu gt ; Zn. The organs dingtanensis N, P, K content of fruit gt ; leaves gt ; root gt ; stems Ca content of leaves the gt ; fruit gt ; roots gt ; stems Mg content of leaves gt ; roots gt ; If gt ; stems ; trace elements in the Fe content of the root gt ; stem gt ; fruit gt ; leaf, Mn, Cu content in the root gt ; leaves gt ; fruit gt ; stems Zn content of leaves gt ; roots gt ; fruit gt ; stems. Accumulation of plant nutrients dingtanensis with pepper-age change and significant change. If pre-element Contents : leaf gt ; stem gt ; roots, trace elements root gt ; stem gt ; leaves ; fruit of a large number of elements content : If gt ; stem gt ; leaves gt ; roots, trace elements : stem gt ; roots gt ; fruit gt ; leaves.

Mots clés : Tarim Temporal and spatial variation Wind erosion Dustfall Ingredient

Présentation (Dissertation topics)

Page publiée le 19 octobre 2014, mise à jour le 10 octobre 2017