[Nest habitat quality evaluation for the oriental great reed warbler (Acrocephalus orientalis) in Baiyangdian Wetland].

The Baiyangdian Wetland Natural Reserve is an important breeding habitat for oriental great reed warbler (OGRWs), Acrocephalus orientalis, in North China Plain. We investigated the nesting sites of OGRWs by line transect method during June-July, 2011, and 112 nests were found out in total. The ecological-niche factor analysis (ENFA) was applied in nesting habitat suitability assessment for OGRWs in Baiyangdian. The results showed that OGRWs in this reserve preferred nesting in dry land reed landscapes, which located at relatively high altitudes and away from anthropocentric disturbance. In 2011, the suitable and the most suitable nesting habitats of OGRWs in this reserve were 2474.69 hm2 and 1131.19 hm2, accounting 7.6% and 3.5% of the total reserve area, respectively. The most suitable nesting habitats shaped a circle-like structure, and they all clustered together around Damai and Shaoche core area, which located in the east part of the reserve. In order to protect the nesting habitats for OGRWs within Baiyangdian wetland reserve, it was suggested that the functional zone should be reorganized, and that the Damai and Shaoche core area should be integrated into one. This new core area would be bigger and more concentrated, at the same time the buffer zone should also be established appropriately, so as to protect the natural landscapes in this reserve as much as possible.

[Suitability evaluation of great bustard (Otis tarda)'s wintering habitat in Baiyangdian basin].

Based on the related researches of great bustard's wintering habitat selection as well as the advices of related experts and the distribution records of great bustard in Baiyangdian basin, 3 first class indices and 13 second indices were chosen to characterize the key factors affecting the wintering habitat selection of great bustard, and a habitat quality evaluation model was built to assess the quality of wintering habitat selection of great bustard in Baiyangdian basin. In 2005, the suitable wintering habitats of great bustard in the basin had an area of 11907.25 km2, accounting for 34.1% of the total. Of the suitable wintering habitats, the most suitable habitats had an area of 4596.25 km2, only 13.2% of the total and comparatively concentrated in two zones, i.e., Baiyangdian Wetland Natural Reserve and its peripheral area (zone I) in the east of Baiyangdian basin, and Xingtang and Quyang counties (zone II) in the southwest of Baiyangdian basin. The total area of the most suitable habitats in zone I and zone II was 2803.55 km2, accounting for 61.0% of the most suitable habitats in the basin. To protect the wintering habitat of great bustard in the basin, proper measures should be taken according to the environmental features of the two zones.

[Environmental characteristics of the atrazine in the waters in East Liaohe River Basin].

Based on the field investigation and the Laboratory experiment, and taking the Geographic Information System (GIS) techniques as the key data disposal platform, the spatial and temporal differences and the enrichment characteristics of atrazine in the surface water in East Liaohe River Basin were systematically analyzed, the effect factors on that also were interpreted. The results show that, the average atrazine content in waters in regions with glebe or without glebe were namely 9.71 microg x L(-1) and 8.854 microg x L(-1), and the lower reach of the trunk was formed as the focus filed of the atrazine in waters. July is the month that the water contained the largest atrazine with the maximum content of 18.93 microg x L(-1). The spatial pattern of the atrazine in the waters clearly shows that, the atrazine used in the glebe are endangering the surface waters quality in the whole basin and will worsen the waters environment of East Liaohe River basin. The normalized enrichment index of the atrazine in the surface water related to plant atrazine is 0.605-1.750 with the spatial difference, the right part of the trunk is the continuous region with high index, the left part of the trunk is on the contrary, and the lower reaches is the focus region with high index. The normalized enrichment index of the atrazine in the surface waters related to soil atrazine has the spatial difference same to the index related to soil, however, the region with large index or little index has the scattering features. With respect to the effect of soil on the atrazine in the water, the integrated token index of the low moor peat soil is the largest and the peat moor soil and the paddy soil are the least. With respect to effect of the landscape pattern on the atrazine in the surface waters, the integrated token index will increase with the interaction between patches. With a certain range, the integrated token index will increase with the precipitation and runoff; however, the integrated token index will decrease with precipitation if the precipitation excesses the range.

[Spatial and temporal variation of the natural reproducible ability of water resource in the northeast part of China and its response to the land use change].

With respect to the water cycling, the natural reproducible ability of water resource (NRAWR) was expressed, and the spatial and temporal differences of NRAWR in the northeast part of China were anatomized systematically with the GIS techniques. Furthermore, the response of NRAWR in the northeast part of China to land use changes was described based on land use patterns of the northeast part of China in 1986,1996 and 2000. Water resource in the northeast part of China has the distinct spatial and temporal variation during the period from 1956 to 2001 with the multi-year volume of 199.152 billion m(3), and the temporal change of NRAWR has 33-year, 11-year and 4-year cycles. In the phase from 1980 to 2001, the NRAWR in the northeast part of China has the descending trend, and the yearly variation range and intensity have marked spatial evolutional features. The coupling change of NRAWR and land use change shows that, in order to maintaining an higher NRAWR level under the condition of the acute anthropic interferes in the northeast part of China, the land use pattern should be adjusted based on the distributed eco-hydrological mechanism.