Spatial-temporal Evolution and Prediction of Ecosystem Carbon Storage on Hainan Island by Coupling InVEST and FLUS Models [PDF]
, 2023 [Objective] The influence of land use changes on carbon storage were studied under the expansion of urbanization in Hainan Island to reveal the spatial-temporal evolution pattern of carbon storage and to predict future development trends in order to ...
Chen Xu +5 more
core +1 more source
Shuitu baochi tongbao, 2022 [Objective] The response law for runoff under different land use scenarios in the middle and upper reaches of the Weihe River was analyzed in order to provide scientific support for development planning and water resource management of the middle and ...
Zhang Ye +9 more
doaj +1 more source
Temporal and Spatial Changes of Land Use and Their Eco-environmental Effects in Nanchang City from 2000 to 2020 [PDF]
, 2022 [Objective] The regional ecological environmental effects caused by land use changes in Nanchang City by determining the quantitative relationships between regional land and resource development and ecological environments were analyzed in order to ...
Tang Jianglong +2 more
core +1 more source
Effects of Land Use Change on Imbalance in Ecosystem Services:A Case Study of Laizhou Bay Coastal Zone [PDF]
, 2016 以莱州湾海岸带为研究区,基于2000年、2005年、2010年和2014年多时相土地利用数据,应用生态系统服务价值评估,逐层剖析土地利用变化对生态系统服务失衡特征的影响。结果表明:莱州湾海岸带供水与空气组分调节服务呈负值,2000~2014年,生态系统服务总价值丧失43%(147亿美元/a),生态系统服务多样性降低甚至丧失,呈向海性,围填海造成162亿美元生态损失。土地利用变化方式是造成生态失衡的主因,主要包括:交通工矿、盐田、养殖及城镇扩张,滩涂、河口湿地、耕地被侵占。滩涂和河口湿地减少,导致废物处理、
侯西勇 +4 more
core +1 more source
Analysis of Carbon Stock Evolution and Its Vulnerability Characteristics Based on Land Use Change in Guizhou Province [PDF]
, 2023 [Objective] The spatial and temporal distribution pattern and evolution characteristics of ecosystem carbon storage, its response to land use change, and the vulnerability of ecosystem carbon storage service in each county of Guizhou Province were ...
Chen Darong +5 more
core +1 more source
Improvement of the Hopfield Neural Network and Transfer-matrix calculation of positional distribution in the 2-dimensional semiflexible polymer [PDF]
, 2006 摘要本文主要分为两个部分，第一部分为用蒙特卡罗变异优化选择规则优化Hopfield神经网络，第二部分为转移矩阵在二维半柔软聚合物研究中的应用。第一部分研究表明蒙特卡罗变异优化选择规则可以用来优化神经网络的性能。在第一部分我们以Hopfield网络为例，运用蒙特卡罗变异优化选择规则在保持网络的整体结构基本不变的情况下，优化Hopfield神经网络的动力学特性，提高网络的存储功能和存储质量。在优化后的网络中，每个记忆模式都被严格设计成网络的不动点吸引子，从而每个模式都能够被精确联想 ...
周震
core +1 more source
Efficient algorithm for computing Walsh spectrum and differential probability [PDF]
, 2015 According to the characteristic of T-functions,along with the definition of narrow T-functions,the linear prop-erty and differential property were studied.Markov chain and transition matrices were constructed to propose fast algo-rithm for computing ...
IUYan L, UBin H, ULi-ping X
core +1 more source
Spatiotemporal Coupling Relationship Between Plateau Pika Disturbance and Alpine Meadow Degradation [PDF]
, 2023 [Objective] Plateau pika (Ochotona curzoniae) is a key species in the alpine meadow ecosystem of the Qinghai-Xizang Plateau. The coupling relationship between pika activity and meadow degradation was analyzed in order to further improve the observation ...
Gao Chongyue +5 more
core +1 more source
Shuitu Baochi Xuebao, 2023 识别三生空间迁移演化规律并掌握其引发的空间性状改变情况,对优化国土空间布局、提高利用水平影响深远。以黄河流域上游城市群为研究对象,基于转移矩阵对研究区2000—2020年三生空间时空演化规律进行分析,并以此为基础,利用强度分析模型,从三生空间一、二级分类双重视角,就空间演化带来的变化稳定性问题进行讨论。结果表明:(1)20年间,研究区三生空间转移变化活跃但发生数量和规模均呈缩减态势,空间转移以呼包鄂榆和宁夏沿黄城市群两地为主,呈东多西少分布特征,但以生态为主、生产和生活空间为辅的整体格局未发生改变。(2)
黄鑫 +5 more
doaj
Shuitu Baochi Xuebao, 2022 利用贵州省1980-2020年逐月降水与土壤水分计算标准化降水指数(SPI)和标准化土壤水分指数(SSI),基于游程理论、传播响应率(Rr)、状态转移概率矩阵等方法探究气象与农业干旱特征变化,以及两者之间的响应关系。结果表明:(1)贵州省农业干旱较气象干旱持续时间长、烈度大,干旱历时空间变化较气象干旱显著,干旱烈度则较单一。(2)季尺度上,春季农业干旱对气象干旱响应最为敏感,夏、秋季次之,冬季较弱;不同地貌类型下,春、冬季在半喀斯特低中山响应程度较高,夏季在峰丛谷地,秋季在非喀斯特地区;不同切割深度下 ...
游漫 +4 more
doaj