From January. 1996 to January 1997, birds survey was carried out in 4 mangrove wetlands in Fujian. As a result, 92 species, belonging to 55 genera, 27 families, and 13 orders were recorded. Among them, 29 species, 31 ...From January. 1996 to January 1997, birds survey was carried out in 4 mangrove wetlands in Fujian. As a result, 92 species, belonging to 55 genera, 27 families, and 13 orders were recorded. Among them, 29 species, 31 52% of the total were passeriformes; 63 species, 68 48% of the total were nonpasseriformes. The survey revealed that the bird communities in Fujian mangrove wetlands had the features as follows:①Nonpasseriformes was more than passeriformes. Wading birds were more abundant in bird communities. ②Farm birds were common and forest birds were scarce. ③Lack of endemic species. ④Winter visitors and passing migrants were dominant in bird communities. ⑤Migrant behaviors varied with species. ⑥Mangrove wetland is important for bird conservation, especially for egrets and migrant wadings.展开更多
CO2 concentrations at different heights in a broadleaved/Korean forest (with a mean height of 26 m) were measured with infrared gas analyzer IRGA (model 2250D, LI-COR Inc. and LI-COR, 820) from Aug. to Oct. of 1999, A...CO2 concentrations at different heights in a broadleaved/Korean forest (with a mean height of 26 m) were measured with infrared gas analyzer IRGA (model 2250D, LI-COR Inc. and LI-COR, 820) from Aug. to Oct. of 1999, Apr. to Jul. of 2000, and from Aug. 2002 to Sept. 2003. Based on the collected dada, the diurnal and seasonal dynamics of profiles and storage of carbon dioxide in the forest were analyzed. The diurnal CO2 profiles showed that the vertical distribution of CO2 concentration were different for daytime and nighttime, and the CO2 concentration was highest close to forest floor, no matter at daytime and nighttime. The seasonal profiles of CO2 showed that stratification in the canopy was evident during growth season. CO2 concentrations at different heights (60 m to 2.5 m) had a little change in March, with a difference of 10 mmolmol-1, but had a significant change in July, with a difference of 60 mmolmol-1. In July, there also existed a greater gradient of CO2 concentrations at canopy (22, 26 and 32 m), with a difference of 8 mmolmol-1. The calculated total storage (ΔC/Δt ) of CO2 in the air column with height of 40 m beneath eddy covariance instrument was negative, and made a little contribution to NEE.展开更多
Mangrove forests occur extensively in the tropic areas rich in wildlife and other non forestry resources and provide a wide array of raw materials for livelihood and production processes and have been a major source o...Mangrove forests occur extensively in the tropic areas rich in wildlife and other non forestry resources and provide a wide array of raw materials for livelihood and production processes and have been a major source of income generation and subsistence for the local people. Exploitation of timber, fuel wood, poles, industrial raw material, and many other non wood products from the mangrove forests give rise to large scale economic activity and income generation. At present, mangrove forests are facing great peril. Reckless exploitation and swampland reclamation result in their gradual degradation. This article deals with the worlds mangrove forest resources and their benefit to people; describes the current status, points out the main causes of the destruction of these forests, presents proposals for protecting mangrove forests, and discusses international cooperation in protecting the world’s mangrove forests.展开更多
文摘From January. 1996 to January 1997, birds survey was carried out in 4 mangrove wetlands in Fujian. As a result, 92 species, belonging to 55 genera, 27 families, and 13 orders were recorded. Among them, 29 species, 31 52% of the total were passeriformes; 63 species, 68 48% of the total were nonpasseriformes. The survey revealed that the bird communities in Fujian mangrove wetlands had the features as follows:①Nonpasseriformes was more than passeriformes. Wading birds were more abundant in bird communities. ②Farm birds were common and forest birds were scarce. ③Lack of endemic species. ④Winter visitors and passing migrants were dominant in bird communities. ⑤Migrant behaviors varied with species. ⑥Mangrove wetland is important for bird conservation, especially for egrets and migrant wadings.
基金This study is supported by The Development Plan of State Key Fundamental Research of China (973) (contract No. 2002CB412502),by Knowledge Innovation Project of CAS (KZCX1-SW-01-03) and by Natural Science Foundation of China (30170167).
文摘CO2 concentrations at different heights in a broadleaved/Korean forest (with a mean height of 26 m) were measured with infrared gas analyzer IRGA (model 2250D, LI-COR Inc. and LI-COR, 820) from Aug. to Oct. of 1999, Apr. to Jul. of 2000, and from Aug. 2002 to Sept. 2003. Based on the collected dada, the diurnal and seasonal dynamics of profiles and storage of carbon dioxide in the forest were analyzed. The diurnal CO2 profiles showed that the vertical distribution of CO2 concentration were different for daytime and nighttime, and the CO2 concentration was highest close to forest floor, no matter at daytime and nighttime. The seasonal profiles of CO2 showed that stratification in the canopy was evident during growth season. CO2 concentrations at different heights (60 m to 2.5 m) had a little change in March, with a difference of 10 mmolmol-1, but had a significant change in July, with a difference of 60 mmolmol-1. In July, there also existed a greater gradient of CO2 concentrations at canopy (22, 26 and 32 m), with a difference of 8 mmolmol-1. The calculated total storage (ΔC/Δt ) of CO2 in the air column with height of 40 m beneath eddy covariance instrument was negative, and made a little contribution to NEE.
文摘Mangrove forests occur extensively in the tropic areas rich in wildlife and other non forestry resources and provide a wide array of raw materials for livelihood and production processes and have been a major source of income generation and subsistence for the local people. Exploitation of timber, fuel wood, poles, industrial raw material, and many other non wood products from the mangrove forests give rise to large scale economic activity and income generation. At present, mangrove forests are facing great peril. Reckless exploitation and swampland reclamation result in their gradual degradation. This article deals with the worlds mangrove forest resources and their benefit to people; describes the current status, points out the main causes of the destruction of these forests, presents proposals for protecting mangrove forests, and discusses international cooperation in protecting the world’s mangrove forests.
