Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
MAN Duoqing
LI Delu
LIU Mingcheng
ZHANG Dekui
TANG Jinnian,CHEN Fang
FU Guiquan
YANG Xuemei
DING feng
Abstract： Through eco-measurement and research at the Xishawo desert pasture in Minqin for 60 a, it was foundthat desert vegetation flora has experienced four main stages with ground water- table decline, they were thedegraded meadow steppe and Tamarix flora, Tamarix and Nitraria flora, Nitraria and degraded Tamarix flora, andNitraria flora, the plant diversity and coverage dcreased in the processing, eco- degradation and desertificationdeveloped remarkably; with rain-fed area enlargement, desert herbal plants grew when precipitation was higher inthe year, the plant diversity and coverage increased, and vice versa; some desert shrubs were relatively stable, itspopulation growth and development improved when precipitation was over 140 mm, 100-140 mm for basicgrowth, and < 100 mm degraded gradually; most plant species of windbreak and sand- fixation afforestationdegraded under drought conditions, Haloxylon ammodendron had strong eco- adaptability as an introducedspecies, it has developed into the biggest man-made windbreak and sand-fixation forest in Minqin desert areas, itsbig density and drought land were the main reasons for degradation, and sustainability could be increased underlow density afforestation according to local plant carry capacity. Recently, with the integrated programimplementation in the Shiyang River watershed area, eco- water has been increased, groundwater table hasincreased in some surroundings, some micro-wetlands have formed, original desert meadow steppe has reoccured,and their ecosystems are developing positively; however, ground water table still reduces slowly in most desertareas, and desertification has developed.
Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Other Disciplines of Agriculture, Forestry,Livestock & Aquatic Products Science submitted time 2023-02-17 Cooperative journals: 《智慧农业（中英文）》
Abstract： Dynamic monitoring and quantitative estimation of forage crop growth are of great importance to the large-scale production of forage crop. UAV remote sensing has the advantages of high resolution, strong flexibility and low cost. In recent years, it has developed rapidly in the field of forage crop growth monitoring. In order to clarify the development status of forage crop growth monitoring and find the development direction, first, methods of UAV crop remote sensing monitoring were briefly described from two aspects of data acquisition and processing. Second, three key technologies of forage crop including canopy information extraction, spectral feature optimization and forage biomass estimation were described. Then the development trend of related research in recent years was analyzed, and it was pointed out that the number of papers published on UAV remote sensing forage crop monitoring showed an overall trend of rapidly increasing. With the rapid development of computer information technology and remote sensing technology, the application potential of UAV in the field of forage crop monitoring has been fully explored. Then, the research progress of UAV remote sensing in forage crop growth monitoring was described in five parts according to sensor types, i.e., visible, multispectral, hyperspectral, thermal infrared and LiDAR, and the research of each type of sensor were summarized and reviewed, pointing out that the current researches of hyperspectral, thermal infrared and LiDAR sensors in forage crop monitoring were less than that of visible and multispectral sensors. Finally, the future development directions were clarified according to the key technical problems that have not been solved in the research and application of UAV remote sensing forage crop growth monitoring: (1) Build a multi-temporal growth monitoring model based on the characteristics of different growth stages and different growth years of forage crops, carry out UAV remote sensing monitoring of forage crops around representative research areas to further improve the scope of application of the model. (2) Establish a multi-source database of UAV remote sensing, and carry out integrated collaborative monitoring combined with satellite remote sensing data, historical yield, soil conductivity and other data. (3) Develop an intelligent and user-friendly UAV remote sensing data analysis system, and shorten the data processing time through 5G communication network and edge computing devices. This paper could provide relevant technical references and directional guidelines for researchers in the field of forage crops and further promote the application and development of precision agriculture technology.
Subjects: Biology >> Botany >> Applied botany submitted time 2018-12-04 Cooperative journals: 《广西植物》
Abstract：桃是我国重要的果树种类，分布十分广泛，在水果生产中排第四位，然而适合南方栽培的品种稀少。通过资源调查在广西大学标本园内的一棵台湾早熟蜜桃大枝上发现一个芽变新种质，命名为‘五月红’，进一步对其主要生物学特性、植物学性状以及果实经济性状等进行观测分析，同时通过 SRAP 分子标记检测与母株台湾早熟蜜桃的差异性。结果表明：‘五月红’芽变新种质成熟期比台湾早熟蜜桃提前 20 天左右，5 月上中旬成熟，果变大，核变小，可食率提高，并且颜色均匀，可溶性固形物含量显著提高，保持了台湾早熟蜜桃需冷量低、品质优良和风味极佳的优点，属于特早熟优质种质资源；通过琼脂糖电泳检测 SRAP 扩增组合引物 me9/em5 在‘五月红’DNA 样品中能够扩增到 1200 bp 大小的特异性条带，表明‘五月红’在 DNA 遗传水平上与母株台湾早熟蜜桃发生了变异，属于新的特早熟种质资源。‘五月红’芽变新种质的发现将为适合南方栽培的特早熟桃品种的选育提供重要材料，有助于优化不同熟期品种的栽培结构，进而促进南方桃种植产业经济效益的提高。
Hits
Hits
Downloads
Comment