Effects of Different Land Use Patterns on Soil Microbial Quantity and Activity in Hongta District,Yuxi City

[Objective] This study aimed to investigate the effects of different land use patterns on soil ecological environment. [Method] Total three representative land use patterns （corn field, cherry tree land, wood land） were selected from Hongta District, Yuxi City, and under these three patterns, soil microbial quantity and activity were studied. [Result] Under the three land use patterns, soil microorganisms were domi- nated by bacteria; soil microbial quantity ranked as wood land＇s〉cheery tree land＇s〉 corn field＇s; and total microbial activity, catalase activity and urease activity all ranked as cherry tree land＇s〉wood land＇s〉corn field＇s. [Conclusion] Soil microbial activity and functions are related to farmland management measures, as well as land use pattern and soil nutrients.

Land Use Change in Hongta District in Yuxi City, China Based on Archived Landsat Data of the Past 30 Years

Urban expansion, which has affected ecosystem functioning and services at local to global scale, is projected to have aggravating impacts on landscape in the future. A detailed study on spatiotemporal patterns of Hongta District in Yuxi City over a relatively long timeframe was conducted using multi-temporal Landsat TM, ETM+ and OLI data of 1987-2017 associated with Geographic Information System techniques and landscape analysis approaches. Results showed that sealed surfaces (urban area) have expanded from 1.4% to 11.8%, with an annually increasing rate of 7.63%. Trees, farm areas and barren lands all underwent a slight reduction during this time period, whereby 23.8% of farms and 9.8% of bare lands transferred into sealed surfaces. Focusing on the urban expansion pattern, it presents a uninuclear polarizing polygon mode illustrating the urbanization sprawl over time to all directions. The greatest expansions are seen in NNE and SSE direction, mainly because of the topographic constraints. A trade-off between urbanization and sustainable development is under investigation by reclaiming barren soil at the mountain range to transfer farming areas from low altitude plains to make way for urban growth.

低碳经济导向下玉溪市红塔区土地可持续利用研究

土地利用变化是碳排放变化的主要驱动力,揭示土地利用变化对碳排放的影响对于区域土地的可持续利用和碳排放政策的制定具有指导意义。本文以玉溪市红塔区为研究区域,借助ArcGIS 10.7、ENVI 5.3等软件,基于空间分析技术对研究区土地利用变化及碳排放情况进行分析。结果表明:2010—2020年,红塔区耕地、林地、草地、灌木地均在减少,建设用地数量增加;土地利用类型的变化引起了红塔区碳排放与碳吸收的变化,特别是建设用地的快速增长间接造成碳排放量的大幅增长,对区域可持续发展造成了一定压力。因此,转变经济发展方式,积极推进产业结构转型升级,加大耕地、林地、草地、灌木地等生态屏障的保护力度,是实现区域可持续发展的必由之路。

玉溪市红塔区不同土地利用方式对土壤微生物数量及活性的影响

[目的]研究不同土地利用方式对土壤生态环境的影响。[方法]在玉溪市红塔区选取玉米地、樱桃地、林地3种代表性土地利用方式,测定3种土地利用方式下土壤微生物的数量及活性。[结果]3种土地利用方式下,土壤微生物类群中细菌占绝对优势,微生物总数从大到小依次为林地、樱桃地、玉米地;微生物总活性、过氧化氢酶活性和脲酶活性从大到小依次为樱桃地、林地、玉米地。[结论]微生物活性和功能除了与土地利用方式、土壤养分有关外,还与农田管理措施有关。

玉溪市红塔区水土流失现状及防治规划

分析了玉溪市红塔区水土流失的现状和引起水土流失的自然与人为因素。提出了红塔区水土保持生态环境建设的原则、目标和阶段任务 ,以及开展水土保持的相应治理措施。

红塔区施肥、浇水措施对漾濞泡核桃苗木生长的影响研究

2009年玉溪红塔区引种漾濞泡核桃,恰逢2009～2012年连续4年异常干旱,本研究针对该区域凤凰街道办事处灵秀二组种植的漾濞泡核桃,采用尿素、复合肥、磷复肥、核桃专用肥、缓释肥5种不同肥料施肥,并进行春季浇水次数为0次、1次、2次、3次试验,检测核桃苗木地径、高生长及挂果情况。试验结果表明,漾濞泡核桃按照每年浇水3次,并对其进行修剪(整形)、病虫防控管理的条件下,不同种类肥料促进漾濞泡核桃苗高生长差异性显著,缓释肥促进苗木高生长效果最显著,施用4年后,苗高可达3.50±0.68 m,苗木地径达11.2±1.25 cm;不浇水漾濞泡核桃苗木基本不长,浇水次数越多苗木高生长越大、地径也越大;在供水条件跟上,每年春季浇水3次的情况下,试验用的尿素、复合肥、磷复肥、核桃专用肥、缓释肥5种肥料,施用3年均可挂果;肥料充足,都施用缓释肥,每年春季浇水次数不同,挂果历时明显不同,浇水3次,定植3年就开始挂果;浇水2次,定植4年开始挂果;浇水1次和不浇水,不挂果。

玉溪市红塔区民间药用植物资源调查研究

采用参与式调查、关键人物访谈和文献资料查询等方法,对玉溪市红塔区中心城区三幼、新兴、窑头、葫芦等农贸市场销售的民间传统药用植物进行了调查和分类研究,分析当地民间传统药用植物利用的知识和特点。调查结果表明,该地区民间医药文化知识相当丰富,药用植物种类较多,利用的部位、方法、用途多样。共收集到179种药用植物,隶属73科115属。