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冬小麦夏玉米农田土壤呼吸与碳平衡的研究 被引量:48
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作者 黄斌 王敬国 +2 位作者 龚元石 karl stahr 杨倩 《农业环境科学学报》 CAS CSCD 北大核心 2006年第1期156-160,共5页
为探讨不同农作措施下的农田碳平衡规律,研究农田对大气CO2的“源”、“汇”特征,2000年至2003年连续测定了不同秸秆管理、灌溉和氮肥施用等种植措施下华北冬小麦、夏玉米生长季的土壤呼吸。结果表明,农田CO2释放主要受气温、土壤水分... 为探讨不同农作措施下的农田碳平衡规律,研究农田对大气CO2的“源”、“汇”特征,2000年至2003年连续测定了不同秸秆管理、灌溉和氮肥施用等种植措施下华北冬小麦、夏玉米生长季的土壤呼吸。结果表明,农田CO2释放主要受气温、土壤水分状况和有机物投入量等因素的影响。秸秆还田与优化灌溉增加了土壤呼吸的强度,不同农作措施间土壤呼吸的差异主要发生在冬小麦生长季。对农田碳平衡研究的计算结果显示,农田系统在常规种植措施下表现为大气CO2的“汇”。在传统农作措施下,华北冬小麦、夏玉米生长季植物碳净固定量(NPP)与土壤碳排放量(Rm)的比值分别为1.16、1.21。 展开更多
关键词 土壤呼吸 碳平衡 冬小麦 夏玉米
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Participatory and Integrated Research in Mountainous Regions of Thailand and Vietnam:Approaches and Lessons Learned 被引量:2
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作者 Andreas Neef Franz Heidhues +1 位作者 karl stahr Pittaya Sruamsiri 《Journal of Mountain Science》 SCIE CSCD 2006年第4期305-324,共20页
Participatory and integrated research approaches employed by a long-term Thai- Vietnamese-German collaborative research program, ‘The Uplands Program’, that address the vicious circles of resource scarcity, environm... Participatory and integrated research approaches employed by a long-term Thai- Vietnamese-German collaborative research program, ‘The Uplands Program’, that address the vicious circles of resource scarcity, environmental degrada- tion and rural poverty in mountainous regions of northern Thailand and northern Vietnam are discussed in this paper. We present two examples from the Thai component of the research program to show how different disciplines and stakeholders need to cooperate at different scales to make meaningful scientific contributions towards sustainable land use and rural development in mountainous regions. The case of resource conservation in the Thai highlands shows that local and scientific knowledge, conven- tional surveys and participatory modeling can be creatively combined. Integrated research on the potential of integrating fruit trees and associated technologies into mountain farming systems suggests that natural scientists have to work alongsideeconomists and social scientists to avoid harmful effects of purely technology-driven and productivity- enhancing approaches. The success of new technologies cannot be measured solely by adoption rates and yield increases, but also needs to take into account their long-term impact on various groups of farmers and the ecological, economic and social trade-offs that they entail. Technical and institutional innovations need to go hand in hand to provide viable livelihood opportunities for smallholder farmers in mountain watersheds. The major lesson learned from the first six years of our research in the mountains of Thailand and Vietnam is that conventional and participatory approaches are not antagonistic; if scientists from various disciplines and research paradigms are open-minded, the combination of both approaches can produce meaningful results that cater for the needs of both the academic community and local stakeholders in mountain environments. 展开更多
关键词 泰国 越南 山区开发 国际协作研究项目 综合研究 参与式研究 分担法 经验 教训
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Lessons Learned and Future Challenges for Integrated and Participatory Approaches to Mountain Research——Conclusions from the Mountain Symposium and this Special Issue
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作者 Franz Heidhues karl stahr +2 位作者 Uwe Jens Nagel David Thomas Andreas Neef 《Journal of Mountain Science》 SCIE CSCD 2006年第4期347-354,共8页
关键词 山区开发 国际研讨会 专刊 可持续民生 可持续生态系统 综合研究 分担研究
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Integrated and Participatory Research Approaches towards Sustainable Livelihoods and Ecosystems in Mountainous Regions
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作者 Andreas Neef Franz Heidhues +2 位作者 karl stahr David Thomas Pittaya Sruamsiri 《Journal of Mountain Science》 SCIE CSCD 2006年第4期271-275,共5页
关键词 山区 可持续民生 可持续农业-生态系统 综合研究法 参与式研究法 多学科研究
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