森林火灾模型作为森林火灾防治的重要科学依据和技术支撑,近年来受到越来越多的关注。以Web of Science核心合集为数据源,采用文献计量学方法,利用Bibliometrix软件包,分析了2002—2022年森林火灾模型的研究热点和发展趋势。研究表明,...森林火灾模型作为森林火灾防治的重要科学依据和技术支撑,近年来受到越来越多的关注。以Web of Science核心合集为数据源,采用文献计量学方法,利用Bibliometrix软件包,分析了2002—2022年森林火灾模型的研究热点和发展趋势。研究表明,近20年来,森林火灾模型的相关研究发文量整体呈现上升趋势,取得了大量研究成果。模型在森林火灾风险评估与预测、火势蔓延模拟和火灾影响评估方面得到了广泛应用。森林火灾风险预测模型向大规模、高精度演化,蔓延模拟模型向智能化、立体化发展,环境影响模型朝长期性、整体性方向拓宽。未来研究和实践中应注重强化模型的数据支撑、提高模型的有效性和专业化水平,以及提升模型的系统化和普适性。展开更多
日益增加的农业废弃物已成为全球环境污染的重要来源。妥善、快速地处理这些大量的废弃物对农业和生态环境的可持续发展至关重要。揭示当下牛粪堆肥发酵研究领域的研究现状,预测未来研究热点,对于未来该领域相关研究工作的深入研究方向...日益增加的农业废弃物已成为全球环境污染的重要来源。妥善、快速地处理这些大量的废弃物对农业和生态环境的可持续发展至关重要。揭示当下牛粪堆肥发酵研究领域的研究现状,预测未来研究热点,对于未来该领域相关研究工作的深入研究方向至关重要。采用文献计量学方法,对2014—2023年Web of Science核心合集和中国知网数据库收录的牛粪堆肥发酵领域相关论文的发文特征、研究热点及其演化趋势进行定量分析,并借助CiteSpace软件进行可视化。分析结果表明:自2018年起,国外关于牛粪堆肥发酵研究的发文量显著增加,为40~85篇,远高于国内;国内发文量保持稳定;国内研究机构合作松散,以区域合作为主。国际上,中国高校为主导,研究分支多。国外研究合作强度大,核心作者发表量高,但未形成固定群;国内合作网络弱,研究分支少,多中心、分散。国外研究主题广泛,内容细致,深入探讨微生物效用和基础理论。国内研究集中于堆肥材料和工艺优化,侧重农业生产实践。农业废弃物再利用和牛粪堆肥发酵研究焦点转向微生物学机制、工艺优化和质量提升。研究结果展示了近10年来牛粪堆肥发酵的发展历程和研究热点,为相关研究挖掘出新研究方向提供了参考。展开更多
Improving cultivated land use eco-efficiency(CLUE)can effectively promote agricultural sustainability,particularly in developing countries where CLUE is generally low.This study used provincial-level data from China t...Improving cultivated land use eco-efficiency(CLUE)can effectively promote agricultural sustainability,particularly in developing countries where CLUE is generally low.This study used provincial-level data from China to evaluate the spatiotemporal evolution of CLUE from 2000 to 2020 and identified the influencing factors of CLUE by using a panel Tobit model.In addition,given the undesirable outputs of agricultural production,we incorporated carbon emissions and nonpoint source pollution into the global benchmark-undesirable output-super efficiency-slacks-based measure(GB-US-SBM)model,which combines global benchmark technology,undesirable output,super efficiency,and slacks-based measure.The results indicated that there was an upward trend in CLUE in China from 2000 to 2020,with an increase rate of 2.62%.The temporal evolution of CLUE in China could be classified into three distinct stages:a period of fluctuating decrease(2000-2007),a phase of gradual increase(2008-2014),and a period of rapid growth(2015-2020).The major grain-producing areas(MPAs)had a lower CLUE than their counterparts,namely,non-major grain-production areas(non-MPAs).The spatial agglomeration effect followed a northeast-southwest strip distribution;and the movement path of barycentre revealed a"P"shape,with Luoyang City,Henan Province,as the centre.In terms of influencing factors of CLUE,investment in science and technology played the most vital role in improving CLUE,while irrigation index had the most negative effect.It should be noted that these two influencing factors had different impacts on MPAs and non-MPAs.Therefore,relevant departments should formulate policies to enhance the level of science and technology,improve irrigation condition,and promote sustainable utilization of cultivated land.展开更多
文摘森林火灾模型作为森林火灾防治的重要科学依据和技术支撑,近年来受到越来越多的关注。以Web of Science核心合集为数据源,采用文献计量学方法,利用Bibliometrix软件包,分析了2002—2022年森林火灾模型的研究热点和发展趋势。研究表明,近20年来,森林火灾模型的相关研究发文量整体呈现上升趋势,取得了大量研究成果。模型在森林火灾风险评估与预测、火势蔓延模拟和火灾影响评估方面得到了广泛应用。森林火灾风险预测模型向大规模、高精度演化,蔓延模拟模型向智能化、立体化发展,环境影响模型朝长期性、整体性方向拓宽。未来研究和实践中应注重强化模型的数据支撑、提高模型的有效性和专业化水平,以及提升模型的系统化和普适性。
文摘日益增加的农业废弃物已成为全球环境污染的重要来源。妥善、快速地处理这些大量的废弃物对农业和生态环境的可持续发展至关重要。揭示当下牛粪堆肥发酵研究领域的研究现状,预测未来研究热点,对于未来该领域相关研究工作的深入研究方向至关重要。采用文献计量学方法,对2014—2023年Web of Science核心合集和中国知网数据库收录的牛粪堆肥发酵领域相关论文的发文特征、研究热点及其演化趋势进行定量分析,并借助CiteSpace软件进行可视化。分析结果表明:自2018年起,国外关于牛粪堆肥发酵研究的发文量显著增加,为40~85篇,远高于国内;国内发文量保持稳定;国内研究机构合作松散,以区域合作为主。国际上,中国高校为主导,研究分支多。国外研究合作强度大,核心作者发表量高,但未形成固定群;国内合作网络弱,研究分支少,多中心、分散。国外研究主题广泛,内容细致,深入探讨微生物效用和基础理论。国内研究集中于堆肥材料和工艺优化,侧重农业生产实践。农业废弃物再利用和牛粪堆肥发酵研究焦点转向微生物学机制、工艺优化和质量提升。研究结果展示了近10年来牛粪堆肥发酵的发展历程和研究热点,为相关研究挖掘出新研究方向提供了参考。
基金supported by the National Natural Science Foundation of China(72373117)the Chinese Universities Scientific Fund(Z1010422003)+1 种基金the Major Project of the Key Research Base of Humanities and Social Sciences of the Ministry of Education(22JJD790052)the Qinchuangyuan Project of Shaanxi Province(QCYRCXM-2022-145).
文摘Improving cultivated land use eco-efficiency(CLUE)can effectively promote agricultural sustainability,particularly in developing countries where CLUE is generally low.This study used provincial-level data from China to evaluate the spatiotemporal evolution of CLUE from 2000 to 2020 and identified the influencing factors of CLUE by using a panel Tobit model.In addition,given the undesirable outputs of agricultural production,we incorporated carbon emissions and nonpoint source pollution into the global benchmark-undesirable output-super efficiency-slacks-based measure(GB-US-SBM)model,which combines global benchmark technology,undesirable output,super efficiency,and slacks-based measure.The results indicated that there was an upward trend in CLUE in China from 2000 to 2020,with an increase rate of 2.62%.The temporal evolution of CLUE in China could be classified into three distinct stages:a period of fluctuating decrease(2000-2007),a phase of gradual increase(2008-2014),and a period of rapid growth(2015-2020).The major grain-producing areas(MPAs)had a lower CLUE than their counterparts,namely,non-major grain-production areas(non-MPAs).The spatial agglomeration effect followed a northeast-southwest strip distribution;and the movement path of barycentre revealed a"P"shape,with Luoyang City,Henan Province,as the centre.In terms of influencing factors of CLUE,investment in science and technology played the most vital role in improving CLUE,while irrigation index had the most negative effect.It should be noted that these two influencing factors had different impacts on MPAs and non-MPAs.Therefore,relevant departments should formulate policies to enhance the level of science and technology,improve irrigation condition,and promote sustainable utilization of cultivated land.
