天山荒漠景观内土壤机械地球化学垒的研究

天山荒漠景观内土壤中存在两种形式的机械地球化学垒，即由水流流速变化形成的机械地球化学垒和由于空气流速变化形成的机械地球化学垒。由于地球化学垒内土壤中粘粒的聚集，使得铁族元素Ｔｉ、Ｖ、Ｍｎ、Ｆｅ、Ｃｏ、Ｃｕ、Ｚｎ及Ｌｉ、Ｋ、Ｂ、Ｆ等元素在其内聚集。Ｂ、Ｃｕ、Ｆｅ等元素的有效性随其全理的增加而增加，Ｆ元素的有效性除与全量有关外，还受其它因素影响，变化效复杂。

STUDY ON MECHANIC GEOCHEMICAL BARRIERS IN SOILS OF ARID-DESERT LANDSCAPES IN TIANSHAN MOUNTAINS, XINJIANG

Mechanic geochemical barriers are the main types of geochemical barriers. There are two forms of mechanic geochemical barriers on the basis of author's researches. The first mechanic geochemical barrier is formed by change of water-flow velocity, which is distributed in exit of river or depress along piedmont of the Tianshan Mountains. The second one is formed by decrease of air-flow velocity due to resistance of the mountains, which is distributed along margins of the Tianshan Mountains. The studies on element geochemistry and availability show that Ti, V, Mn, Fe, Co, Cu, Zn, Li, K, Ba, B and F are accumulated in mechanic geochemical barriers due to accumulation of clay in soils. The availabilities of B, Cu, Fe are increased with their total contents. The availability of F is affected by the other factors besides its total content, resulting in complex changes in soils. These conclusions have great values for evaluation of environmental quality and planting and fertilizing according to soil types in agriculture.