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生态学杂志 ›› 2011, Vol. 30 ›› Issue (04): 643-649.

• 研究报告 • 上一篇    下一篇

准噶尔盆地南缘“丰收林”胡杨水势

占东霞1,庄丽1**,李卫红2,徐智全1,田中平1   

  1. 1新疆石河子大学生命科学学院, 新疆石河子 832000;2中国科学院新疆生态与地理研究所, 乌鲁木齐 830011
  • 出版日期:2011-04-08 发布日期:2011-04-08

Water potential of Populus euphratica in a ‘foison forest&rsquo|at south edge of Junngar Basin.

ZHAN Dong-xia1, ZHUANG Li1**, LI Wei-hong2, XU Zhi-quan1, TIAN Zhong-ping1   

  1. 1College of Life Sciences, Shihezi University, Shihezi 832000, Xinjiang, China|2Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
  • Online:2011-04-08 Published:2011-04-08

摘要: 以准噶尔盆地南缘150团丰收林的胡杨为研究对象,通过比较其与梭梭和柽柳水势变化的规律,以及与土壤含水量和大气温、湿度的关系,探讨了干旱环境下胡杨水势的变化特点。结果表明:胡杨叶、茎水势日变化呈“V”型,梭梭和柽柳水势日变化呈“W”型。相关分析表明,胡杨老林叶、茎水势与温度呈极显著负相关(r分别为-0.839和-0.818),胡杨幼林的茎水势与温度呈显著负相关(r=-0.650);胡杨幼林叶水势与空气湿度呈正相关(r=0.786)。胡杨老林2 m处叶、茎的清晨水势与5和10 m处均存在显著性差异(P<0.05),而5和10 m处叶、茎的清晨水势无显著差异(P>0.05);2、5和10 m处的叶、茎正午水势均存在显著差异(P<0.05);在20:00,胡杨老林在不同高度叶水势存在显著性差异(P<0.05)。

关键词: 草原, 自由放牧, 吸收和排放

Abstract: Taking the Populus euphratica in Corps 150 ‘foison forest’ at south edge of Junngar Basin as test object, and by comparing it with Haloxylon ammodendron and Tamarix ramosissima, this paper studied the change characteristics of water potential of P. euphratica in arid environment, and analyzed the relationships of these change characteristics with soil moisture and air temperature and humidity. The diurnal variations of P. euphratica  leaf  and stem water potential presented “V” type, while those of H. ammodendron and T. ramosissima’s were in “W” type. For elder P. euphratica , its leaf- and stem water potential was significantly negatively correlated with air temperature (r=-0.839 and -0.818, respectively); for young P. euphratica , its leaf water potential was positively correlated with air humidity (r=0.786), and its stem water potential was significantly negatively correlated with air temperature (r=-0.650). In the morning, the water potential of elder P. euphratica  leaves and stems at height 2 m was significantly different from that of the leaves and stems at heights 5 m and 10 m (P<0.05), but no significant difference was observed for the leaves and stems at heights 5 m and 10 m (P>0.05). At noon, the water potential of elder P. euphratica  leaves and stems at heights 2 m, 5 m, and 10 m all had significant differences (P<0.05); at 20:00, the water potential of the leaves at all heights had significant differences (P<0.05).

Key words: Grassland, Free grazing, Uptake and emission