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Characteristics and dynamics of the soil seed bank at the north edge of Taklimakan Desert

science china Earth sciences 2007年第S1期 122-127页

作者： li ning1,2, feng gu1,3 & tian changyan1 1 xinjiang institute of ecology and geography, chinese academy of science , ürümqi 830011, china 2 Graduate University of chinese academy of science, Beijing 100049, china 3 chinese Agricultural University, College of resources and Environmental sciences, Beijing 100094, china

In order to understand the potential of revegetation of halophytic community at the north edge of Taklimakan Desert, the species structure, storage capacity, the vertical distribution pattern and seasonal dynamics of soil seed bank and their interrelationship with community structure of above-ground plants were investigated. The results show that (i) 9 species were identified from seed bank in different seasons indicating that plant composition in this area was simple. (ii) The seed density in soil was 222±10.79 grain/m2 on average, and showed a seasonal variation range from 132±8.16 grain/m2 in summer to 303±12.70 grain/m2 in autumn. (iii) The similarity coefficient between soil seed bank and above-ground vegetation was 0.778. (iv) Vertically, seed densities declined with soil depth. 82.4% of total seeds were found in the top 3 cm of soil profile. No active seeds were found in soil profile below 6 cm. It is concluded that the seed bank at the north edge of Taklimakan Desert contains active seeds of all plant species observed on above ground, and is able to supply potential contribution to reconstruction of vegetation.

关键词： Taklimakan Desert soil seed bank characteristics dynamics

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Suitable scale of Weigan river plain oasis

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science china Earth sciences 2007年第S1期 56-64页

作者： HU ShunJun1,2, SONG YuDong1, tian changyan1, li YueTan1,4, li XiuCang1,4 & CHEN XiaoBing3 1 Key Laboratory of Oasis ecology and Desert Environment, xinjiang institute of ecology and geography, chinese academy of sciences, ürümqi 830011, china 2 Key Laboratory for Agricultural Soil and Water Engineering in Arid Areas of Ministry of Education, Yangling 712100, china 3 institute of Soil science, chinese academy of sciences, Nanjing 210008, china 4 Graduate University of chinese academy of sciences, Beijing 100049, china

Desert coexists with oasis in long time, and the existence and development of oasis system demand better oasis vegetation ecological system. Oasis scale of arid zone plain encircling water should be determined in case of desertification caused by land over-reclamation under the circumstance of water resources shortage. Steady oasis with virtuous circle must have appropriate land use structure for agriculture, forestry and graziery. The study on the suitable scale and developmental space of oasis will provide theoretical and applicable foundation for effective construction of oases. By analyzing the hydrothermal, water and soil balance, an optimal mathematical model has been established. Based on hydrometeorology data collected for years in Weigan river plain, and by the principle of water balance, a calculation has been made of the water resources for evapotranspiration and the optimal acreage of oasis and cultivated land, which shows that the water resources for evapotranspiration in the Weigan river plain oasis is 22.32×108 m3 and the optimal oasis acreage under the condition of conventional irrigation mode is 3716.06 km2, in which the suitable cultivated land acreage is 1564.79 km2. Under the condition of water-saving irrigation, the suitable oasis acreage is 5515.49 km2, in which the suitable cultivated land acreage is 2322.31 km2. The oasis area had reached 4123 km2, and the cultivated land acreage had reached 1507 km2 after the Agriculture Irrigation Drainage Water Project of World Bank Loan in Weigan river basin was finished in 1997. The oasis and cultivated land acreage will be more suitable, and the oasis scale can be enlarged moderately by means of water saving irrigation.

关键词： suitable size oasis scale hydro-thermal balance equilibrium of water and land Weigan river

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