1. The water parameters and their seasonal changes of Malus micromalus, Prunusameniaca var ansu and Elacagnus angustifolia are studied by using P-V technique under field condition.

应用P一V技术研究了野外条件下海红、山杏和沙枣三个树种的水分参数ROWC_(tlp，RWC_和AWC)及其季节变化规律。

2. It is an ancient species in its own genus and well-adapted to drought environments with fissurate growth and summer dormancy. Methods We selected Dengkou as our research site and collected three stages of P. mongolica (before, during and after fissuration) during August 1-5, 2002 and 2003. We used PV technique and measured several water relations parameters (φ, φ, ROWC, RWC, △(subscript φ), ε etc. in different stages of fissurate growth for comparison and analysis of drought tolerance and its mechanisms. Important findings Different stages of P. mongolica had different abilities and pathways to maintain turgor pressure. Fissurate growth decreased the species'drought tolerance and involved multiple adaptations to drought.

选取内蒙古磴口县境内具有绵刺群落的草原化荒漠区为研究样区，于2002~2003年每年8月1~5日采集未劈裂、正在劈裂和已劈裂植株，运用PV技术对不同劈裂生长状态绵刺的多种水分关系参数φ(下标 s、φ、ROWC、RWC、△、ε进行了测定，从绵刺保持膨压的能力和途径两方面进行了深入探讨；同时结合同一项目研究中绵刺劈裂生长过程中抗氧化酶系统和内源激素方面的研究成果，综合分析并探讨了绵刺劈裂生长的发生机理及其环境适应性。

3. The trail of drought resistance indicated: as drought stress developing, the water parameters of ψ〓〓、ψ〓、RWC〓 and ROWC〓 in seedlings becomes lower, the ability of osmotic adjustment, turgor maintenance and resistant dehydration is improved.

抗旱性试验表明：随着干旱胁迫的发展，苗木通过减少叶面积和蒸腾速率来减少水分散失；通过ψ〓、ψ〓、RWC〓和ROWC〓下降，来提高叶片的渗透调节能力、维持膨压能力和苗木忍耐脱水的能力以忍耐干旱。

4. In a fixedrange, the paratemters were sensitive to water stress.ψπ°, ψ100π, RWC°, ROWC°and b value all showed decreasing trends. Thedecreasing extent of ψπ°was greater than that of ψ100π, and thedecreasing extent of RWC°was greater than that of ROWC°The avalue andεmax showed an increasing trend.

在一定范围内，各项水分参数对水分胁迫反应敏感，ψπ°、ψπ100、RWC°、ROWC°和b值表现为下降趋势，ψπ°下降幅度大于ψπ100，ROWC°大于RWC°；a值和εmax表现为上升趋势。

5. B using press-volume technique, this paper studied the seasonal changes of water potential at saturated point (Ψ, water potential at turgor loss point (Ψ relative osmotic water content at turgor loss point ROWC(superscript thp, relative water content at turgor loss point RWC(superscript tlp, relative content of apoplastic water, bound water/free water V(subscript a/V, and the difference between (Ψ and (Ψ of Reaurnuria trigyna growing on heavy solonchack, non-salinized soil, and saline soil.

运用压力容积技术，研究了4种盐分生境下长叶红砂饱和含水量时最大渗透势Ψ(上标 sat 下标 s、初始质壁分离时的渗透势Ψ(上标 tlp 下标 s初始质壁分离时渗透水相对含量ROWC(上标 tlp、初始质壁分离时的相对含水量RWC(上标 tlp、质外体水的相对含量、束缚水与自由水的比值V(下标 a/V，以及饱和含水量时最大渗透势与初始质壁分离时的渗透势之差的季节变化。