摘要
通过在福建省长汀县红壤严重侵蚀区以持续100%隔离降雨模拟水分亏缺环境,研究土壤含水量变化对先锋造林树种马尾松针叶水势、针叶形态的影响,评价马尾松在水分胁迫下的生态适应性及生理调节机制。结果表明:(1)研究期内,处理组20 cm和80 cm土层土壤含水量持续下降并显著低于对照组(P<0.05),差异达10.93%和12.17%,表明土壤环境已出现水分亏缺;(2)处理组针叶水势(Ψd)持续下降,平均值为-3.73 MPa,显著低于对照组-2.80 MPa(P<0.05),证明处理组土壤含水量下降已对马尾松针叶水势产生了显著的影响,且通过拟合土壤含水量与针叶水势关系得出先锋造林树种马尾松具有较强的抗旱能力;(3)马尾松针叶形态相关指标分析表明,隔离降雨第2 a内对照组与处理组间叶长、叶宽、叶面积的差值均明显大于第1 a内,说明生长减缓是该地区马尾松应对土壤水分亏缺的重要途径。
By continuous 100%rainfall exclusion experiment to simulate continuous soil water stress and analyzing needle water potential and needle form effects of water stress on Pinus massoniana,which was a typical adult pioneer plant in areas of severe red soil erosion,this study was to evaluate the ecological adaptability and physiological regulation mechanism of P.massoniana under water stress.The results showed that:(1)In the study period,the soil moisture content at 20 cm and 80 cm depths of the drought group decreased continuously,and the average contents were significantly lower than those of the control group by 10.93%and 12.17%,respectively(P<0.05),which indicated that the soil environment had been in water deficit.(2)TheΨd of the drought group decreased over the course of the experiment,and the meanΨd(-3.73 MPa)of the drought group was significantly lower than that of the control group(Ψd:-2.80 MPa)(P<0.05).Continuous rainfall isolation in the past year significantly affectedΨd.Moreover,by fitting the relationship between soil moisture content and needle water potential,it was concluded that P.massoniana had a strong drought resistance.(3)The analysis of needle form index showed that the difference of needle length,needle width and needle area between control and drought group in the second year were larger than that in the first year.The slow growth of P.massoniana was an important way to deal with soil water deficit.
作者
林恬
郑选梅
郑怀舟
LIN Tian;ZHENG Xuan-mei;ZHENG Huai-zhou(College of Ecological Environment and Urban Construction,Fujian University of Technology,Fuzhou Fujian 350118,P.R.China;Fujian Provincial Key Laboratory of Plant Ecophysiology,Fuzhou Fujian 350007,P.R.China;Straits College of Finance and Economics,Fujian Jiangxia University,Fuzhou Fujian 350118,P.R.China)
出处
《西部林业科学》
CAS
北大核心
2021年第1期50-55,63,共7页
Journal of West China Forestry Science
基金
国家自然基金项目(31270695)
福建省中青年教师教育科研项目(JT180333,JAT190406)。
关键词
水分胁迫
马尾松
土壤含水量
针叶水势
针叶形态
water stress
Pinus massoniana
soil moisture content
needle water potential
needle form
