Relationship between soil and water conservation practices and soil conditions in low mountain and hilly region of Northeast China   总被引：1，自引：0，他引：1  

Yubin Zhang  Ning Cao  Xiaohong Xu  Feng Zhang  Fei Yan  Xinsheng Zhang  Xinlong Tang 《中国地理科学(英文版)》2014,24(2):147-162

The soil and water conservation practices of ecological restoration（ER）,fish scale pit（FP）,furrow and ridge tillage across the slope（FR）,shrub strips（SS）,and vegetation-covered ridge（VR） are characteristic of the Jixing small watershed of the low mountain and hilly region of Jilin Province,Northeast China. This study aims to elucidate the effects of soil and water conservation practices on soil conditions after the short-term implementation of practices. Soil samples were collected from five soil and water conservation sites（ER,FP,FR,SS,and VR） and two controls（BL and CT） to investigate their properties. To evaluate the influence of soil and water conservation practices on soil quality,an integrated quantitative index,soil quality index（QI）,was developed to compare the soil quality under the different soil and water conservation practices. The results show that not all soil and water conservation practices can improve the soil conditions and not all soil properties,especially soil organic carbon（SOC）,can be recovered under soil and water conservation practice in short-term. Moreover,the QI in the five soil and water conservation practices and two controls was in the following order： ER VR BL FR CT SS FP. ER exhibited a higher soil quality value on a slope scale. In the low mountain and hilly region of Northeast China,ER is a better choice than the conversion of farmlands to planted grasslands and woodlands early in the soil and water conservation program.  相似文献   

Inclusive Multiple Models(IMM) for predicting groundwater levels and treating heterogeneity     

Rahman Khatibi  Ata Allah Nadiri 《地学前缘(英文版)》2021,12(2):713-724

An explicit model management framework is introduced for predictive Groundwater Levels(GWL),particularly suitable to Observation Wells(OWs)with sparse and possibly heterogeneous data.The framework implements Multiple Models(MM)under the architecture of organising them at levels,as follows:(i)Level 0:treat heterogeneity in the data,e.g.Self-Organised Mapping(SOM)to classify the OWs;and decide on model structure,e.g.formulate a grey box model to predict GWLs.(ii)Level 1:construct MMs,e.g.two Fuzzy Logic(FL)and one Neurofuzzy(NF)models.(iii)Level 2:formulate strategies to combine the MM at Level 1,for which the paper uses Artificial Neural Networks(Strategy 1)and simple averaging(Strategy 2).Whilst the above model management strategy is novel,a critical view is presented,according to which modelling practices are:Inclusive Multiple Modelling(IMM)practices contrasted with existing practices,branded by the paper as Exclusionary Multiple Modelling(EMM).Scientific thinking over IMMs is captured as a framework with four dimensions:Model Reuse(MR),Hierarchical Recursion(HR),Elastic Learning Environment(ELE)and Goal Orientation(GO)and these together make the acronym of RHEO.Therefore,IMM-RHEO is piloted in the aquifer of Tabriz Plain with sparse and possibly heterogeneous data.The results provide some evidence that(i)IMM at two levels improves on the accuracy of individual models;and(ii)model combinations in IMM practices bring‘model-learning’into fashion for learning with the goal to explain baseline conditions and impacts of subsequent management changes.  相似文献   

论渔业法之违反捕捞许可规定到共同管理渔区作业行为的法律责任          下载免费PDF全文

洪洁  裴兆斌 《海洋开发与管理》2022,39(1):38-42

近年来我国渔业作业群体的数量明显增多,同时违反捕捞许可到共同管理渔区作业的违法行为也日益严重。在《中华人民共和国渔业法》及相关渔业立法中已经存在明确界定,但是对于法律责任没有具体阐明,严重影响了渔业活动的正常秩序与渔业资源的可持续发展。文章根据违反捕捞许可到共同管理渔区作业的现状出发,结合渔业法等相关规定,分析增设法律责任的必要性与可行性,提出完善相关法律责任,细化责任认定;加大惩治力度,提高违法成本等建议。  相似文献