规范用地行为 净化市场环境——庆安局全面开展用地大清查活动

近日,一场针对违规用地行为的大清查在庆安县拉开序幕。这是庆安县国土资源局决定利用两个月左右时间,在全县辖区内开展一次彻底的建设项目用地执法检查工作,旨在查处违法、规范用地、净化市场环境,还大地于清风,利项目于健康,助发展于和谐。     

Biomass carbon sequestration by planted forests in China

The planted forest area and carbon sequestration have increased significantly in China, because of large-scale reforestation and afforestation in the past decades. In this study, we developed an age-based volume-to-biomass method to estimate the carbon storage by planted forests in China in the period of 1973–2003 based on the data from 1209 field plots and national forest inventories. The results show that the total carbon storage of planted forests was 0.7743 Pg C in 1999–2003, increased by 3.08 times since the early 1970s. The carbon density of planted forests varied from 10.6594 Mg/ha to 23.9760 Mg/ha and increased by 13.3166 Mg/ha from 1973–1976 to 1999–2003. Since the early 1970s, the planted forests in China have been always a carbon sink, and the annual rate of carbon sequestration was 0.0217 Pg C/yr. The carbon storage and densities of planted forests varied greatly in space and time. The carbon storage of Middle South China was in the lead in all regions, which accounted for 23%–36% of national carbon storage. While higher C densities (from 17.79 Mg/ha to 26.05 Mg/ha) were usually found in Northeast China. The planted forests in China potentially have a high carbon sequestration since a large part of them are becoming mature and afforestation continues to grow.     

武陟局：清理违法用地突出“查、改、防”

5月27日,太康县委、县政府在人民广场召开清理清查违法违规用地规范用地秩序动员大会。县委、县政府、县人大、县政协的领导及县直各单位副股级以上干部,各乡（镇）领导班子,全县各行政村、居委会支部书记,城关、城郊、毛庄、独塘、大许寨五乡（镇）在县城规划区域内的行政村全体干部,国土资源局、城乡建设局的全体干部职工和群众近万人参加了大会。县委书记王国玺作了动员报告。     

Effects of afforestation on carbon storage in Boyang Lake Basin, China

By using field survey data from the sixth forest inventory of Jiangxi Province in 2003, the biomass and carbon storage for three studied species （Pinus massoniana, Cunninghamia lanceolata, and Pinus elliottii） were estimated in Taihe and Xingguo counties of Boyang Lake Basin, Jiangxi Province, China. The relationship between carbon density and forest age was analyzed by logistic equations. Spatio-temporal dynamics of forest biomass and carbon storage in 1985-2003 were also described. The results show that total stand area of the three forest species was 3.10 × 10^5 ha, total biomass 22.20 Tg, vegetation carbon storage 13.07 Tg C, and average carbon density 42.36 Mg C/ha in the study area in 2003. Carbon storage by forest type in descending order was： P. massoniana, C. lanceolata and P. elliottii. Carbon storage by forest age group in descending order was： middle stand, young stand, near-mature stand and mature stand. Carbon storage by plantation forests was 1.89 times higher than that by natural forests. Carbon density of the three species increased 8.58 Mg C/ha during the study period. The carbon density of Taihe County was higher in the east and west, and lower in the middle. The carbon density of Xingguo County was higher in the northeast and lower in the middle. In general, the carbon density increased with altitude and gradient. Afforestation projects contribute significantly to increasing stand area and carbon storage. Appropriate forest management may improve the carbon sequestration capacity of forest ecosystems.     

中国西南山地喀斯特与非喀斯特森林的生物量与生产力比较

利用1989—1993年中国西南5省区(广西、贵州、云南、四川包括重庆、湖南)森林清查资料,估算和分析了1968个样点森林的生物量和净第一性生产力特征与空间分布格局,重点比较喀斯特森林与非喀斯特森林生物量与生产力的差异.结果表明:中国西南地区森林平均总生物量为148.66 t.hm-2,净第一性生产力达到9.64 t.hm-2.a-1;喀斯特森林的生物量(124.33 t.hm-2)小于非喀斯特森林(163.48 t.hm-2),而喀斯特森林的生产力(8.67t.hm-2.a-1)总体上也小于非喀斯特森林(9.56 t.hm-2.a-1),但在不同的省份中存在差异;作为西南山地的主要森林类型,亚热带和热带的针叶林与山地针叶林、亚热带常绿阔叶林和常绿落叶阔叶混交林中,喀斯特森林的平均生物量(122.95 t.hm-2)和生产力(8.77t.hm-2.a-1)也均低于非喀斯特森林(分别为152.88 t.hm-2和9.92 t.hm-2.a-1);天然林和人工林中的生物量和生产力同样表现出喀斯特森林低于非喀斯特森林的特征.这种差异说明喀斯特生境严酷,在相同的生物气候条件下,喀斯特土层的浅薄和地下水的渗漏胁迫限制了喀斯特森林的生长和生物量积累.     

温县副县长刘继承要求：强力推进闲置土地清查处理工作

近日,温县治理囤地圈地违规用地土地闲置浪费问题工作领导小组副组长、县政府副县长刘继承主持召开全县闲置土地清查处理工作推进会,对下一步闲置土地清查处理工作进行安排。 2008年以来,温县出让土地中属于这次清查范围的有108宗,目前,对所有出让地块是否动工情况已调查完毕,共发现涉嫌闲置土地6宗,县国土资源局已对6家企业下达了《闲置土地调查通知书》;完成42家已停工开发一年以上的企业建筑占地情况的调查和25家企业投资情况的资料收集工作。     

上海市"七人普"建筑物清查信息系统设计与实现

人口普查是全面掌握人口状况的重要手段.2020年,我国迎来第七次全国人口普查.为明确普查区边界,落实普查机构和普查人员职责范围,上海市在正式入户普查之前开展了建筑物清查工作.根据建筑物清查的工作流程和业务需求,构建了建筑物清查指标体系,搭建了建筑物清查数据库,并利用WebGIS技术设计并研发了建筑物清查信息系统,包括边...     

济源市对违法违规土地案件进行专项清查

本刊讯 近日，济源市政府组织有关部门对1999年1月1日以来的全市用地情况进行全面清查。截至目前，已对清查出的300余宗违法违规案件进行了处理，占违法违规土地案件的85％。     

区域尺度土壤固碳量估算方法评述

增加陆地生态系统碳汇已成为一项重要的减排手段,被纳入有关国际气候变化协定。区域尺度土壤固碳量估算成为当前研究的热点与难点。本文综述了目前国内外常用的区域土壤固碳量估算方法,并依据估算精度与方法差异将这些方法总结为四类:简易模型、清查法、经验模型和基于GIS的机理模型。同时对这四类方法的特点和适用性进行了评述,建议根据研究地区及目的不同选择合适的方法。此后,通过分析土壤固碳机理、数据收集、尺度推移、情景分析和土壤有机质机理模型发展等与区域土壤固碳量估算密切相关的各方面中存在的不足,提出今后区域尺度土壤固碳量估算方法将向耦合土壤有机质机理模型、土壤可溶性碳模型、土地利用模型和区域水文模型的基于GIS平台的区域综合模型方向发展。     

气候变化与湿地

概括介绍了湿地的重要性,详细论述气候变化对不同类型湿地的影响,以及湿地作为温室气体的库、汇和源在缓解气候变化方面所起的作用,并从湿地保护和合理利用的角度,提出缓解气候变化影响的对策,包括:开展湿地资源清查,收集全球各种类型湿地的数据和信息,建立更加完善的气候变化模型,以便将气候变化纳入保护和管理活动;保护、维持或恢复湿地生态系统是减缓全球气候变化的重要措施。