摘要
对2019—2023年黑河中游4个类型荒漠区样地植被生长状况和监测区气温、空气湿度、蒸发量、土壤含水率等自然因子进行监测,分析监测区植被动态变化及其与自然驱动因素的相关性。结果表明:降水量大、空气湿度大、蒸发量小、风速低的年份和月份,植被状况相对较好,盖度、高度、密度和生物量都比较高;相反,降水量小、空气湿度小、蒸发量大、风速高的年份和月份,植被状况相对较差。从年际变化趋势看,各样地植被变化规律很不稳定,总体来说由于降水、气温、空气湿度等关键气象因子数据的不稳定性,植被变化规律也表现出很大的不确定性。从月际数据分析,各样地均表现出5月、6月、7月、8月和9月盖度、生物量、高度较大的特性。4个样地之间植被状况存在很大的差异性,说明气象因子对不同类型荒漠化土地植被的影响是不同的。单从2023年数据看,4个样地植被状况和往年纵向相比有明显长势变弱的趋势,2023年出现持续高温、少雨现象,植被生长量下降,一些植物受高温、干旱影响而死亡,造成植被盖度降低。5年监测数据显示,土壤含水率不论年际还是月际数据变化都没有明显的规律性,只随降水量和蒸发量的变化而变化;土壤含水率明显降低的年份和月份,植被生长也相应缓慢,植被高度、盖度、密度和生物量均受到不同程度的影响。各类数据均表明,样地2土壤含水率明显高于其他3个样地,说明盐碱区(沼泽草地)土地的持水能力要好于其他土地。
The vegetation growth status and natural factors(such as air temperature,air humidity,evaporation,soil moisture content and so on)of four sites in typical desert areas in the middle reaches of Heihe River from 2019 to 2023 were monitored,and the vegetation dynamic changes in the monitoring areas and their correlation with natural driving factors were analyzed.The results showed that in years and months with high precipitation,high air humidity,low evaporation and low wind speed,vegetation conditions were relatively good,with high coverage,height,density and biomass.On the contrary,in years and months with low precipitation,low air humidity,high evaporation and high wind speed,vegetation conditions were relatively poor.From the perspective of interannual variation trend,vegetation change law in various places was very unstable.In general,due to the instability of precipitation,temperature,air humidity and other key meteorological factors,vegetation change law also showed great uncertainty.From the inter-monthly data analysis,all the sites showed the characteristics of high coverage,biomass and height in May,June,July,August and September.At the same time,there were great differences in vegetation status among the four sites,indicating that meteorological factors had different effects on vegetation of different types of desertification land.From the data of 2023 alone,the vegetation status of the four sites showed an obvious trend of weakening compared with that of previous years.In 2023,the phenomenon of continuous high temperature and less rain occurred,and the growth of vegetation declined.Some plants died due to high temperature and drought,resulting in the decrease of vegetation coverage.5-year monitoring data showed that soil moisture content had no obvious regularity in both annual and monthly data changes,and only changed with precipitation and evaporation.In years and months when soil moisture content significantly decreased,vegetation growth was correspondingly slow,and vegetation height,coverage,density
作者
赵玉红
兰天
雷军
郭彩霞
赵明
王艺林
武龙庆
兰晓东
ZHAO Yuhong;LAN Tian;LEI Jun;GUO Caixia;ZHAO Ming;WANG Yilin;WU Longqing;LAN Xiaodong(Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province,Zhangye Gansu 734000;Chengdu University,Chengdu Sichuan 610000)
出处
《现代农业科技》
2024年第18期110-114,118,共6页
Modern Agricultural Science and Technology
基金
甘肃省自然科学基金项目“黑河流域中游北部荒漠区植被群落稳定性对气候变化的响应”(22JR5RG1031)
全国荒漠化和沙化典型地区张掖站荒漠化和沙化定位监测项目(2023)。
关键词
植被动态变化
自然驱动因素
定位监测
黑河中游
荒漠化地区
甘肃张掖
vegetation dynamic change
natural driving factor
location monitoring
middle reaches of Heihe River
desertification area
Zhangye Gansu
