摘要
该研究于内蒙古自治区乌兰察布市四子王旗农牧科学院基地进行,试验采用完全随机区组设计,3个区组内各自设置了对照(CK)、轻度载畜率(LG)、中度载畜率(MG)、重度载畜率(HG)处理,在每个载畜率试验小区内随机设置了4个降水梯度(自然降水、减少50%降水、增加50%降水、增加100%降水),在短花针茅荒漠草原不同载畜率试验基础上模拟降水试验,分析植物地上地下生物量对载畜率和降水变化的响应特征。结果表明:(1)4种载畜率基础上增加50%降水,短花针茅荒漠草原的植物种数显著高于减少50%降水(P<0.05),但与增加100%降水无显著差异;轻度载畜率下增加50%降水时物种数最多。(2)轻度、中度载畜率下增加50%降水地上生物量显著高于减少50%降水和自然降水,但与增加100%降水无显著差异;水分改变均没有使围封、重度载畜率地上生物量出现显著变化。(3)随着载畜率的增加,根系现存量随着土层的深度增加而逐渐降低,水分增加使得根系现存量出现降低趋势。(4)根系现存量与地上生物量呈一次函数极显著正相关关系(R=0.92,P<0.01)。
The study was conducted at the Siziwangqi Agriculture and Animal Husbandry Academy Base in Wulanchabu of Inner Mongolia.The stocking rate test used a completely randomized block design,which is included contrast,light stocking rate,moderate stocking rate and high stocking rate in each of three blocks,and four precipitation gradients were randomly set in each stocking rate test area:natural precipitation,50%reduced,50%increased and 100%increased.The simulated precipitation test and the stocking rate test based on the different stocking rate tests of Stipa breviflora desert were carried out to analyze the corresponding characteristics of the aboveground and underground biomass of the plant on the stocking rate and precipitation and the results have been showed that:(1)the number of plant species in S.breviflora desert based on 4 species of stocking rates in 50%increased precipitation was significantly higher than that of 50%reduced precipitation(P<0.05),but it was no significant difference with 100%increased precipitation,(P>0.05)and in light stocking rate,the number of species in 50%increased precipitation was the most;(2)The aboveground biomass of 50%increased precipitation in light and moderate stocking rate was significantly higher than that of 50%reduced precipitation and environmental rainfall,but it was not different with 100%increased precipitation(P>0.05).Whereas,precipitation did not lead to significant changes in the amount of aboveground biomass(P<0.05)in the enclosure and the heavy stocking rate;(3)With the increase of stocking rate,the root stock decreased gradually as the depth of the soil layer increased,increased water content also reduced the amount of root stock;(4)There was a significant positive correlation which has been shown as a linear function between root exudates and aboveground biomass(r=0.92,P<0.01).
作者
王悦骅
宋晓辉
王占文
康静
韩国栋
王忠武
WANG Yuehua;SONG Xiaohui;WANG Zhanwen;KANG Jing;HAN Guodong;WANG Zhongwu(College of Grassland Resources and Environment Science,Inner Mongolia Agricultural University,Hohhot 010010,China)
出处
《西北植物学报》
CAS
CSCD
北大核心
2018年第8期1526-1533,共8页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家重点研发计划项目(2016YFC0500504)
国家自然科学基金(31560140
31260124
31270502
31760143)
内蒙古自治区重大科技专项和西部之光项目
教育部草地资源重点实验室和农业部饲草加工
生产和高校利用重点实验室以及教育部创新团队(IRT17R59)资助
关键词
短花针茅
荒漠草原
载畜率
降水
地上生物量
根现存量
Stipa breviflora
desert steppe
stocking rate
precipitation
aboveground biomass
root stock
