中文摘要：

以克隆植物结缕草为研究对象，采用18O作为示踪元素，从克隆植株不同生长发育阶段的复合节根系引入H218O，在“异质高水”、“均质低水”两种环境条件下，探测和分析结缕草克隆植株复合节根、匍匐茎、A和B分株叶各构件组分系列内的水分生理整合格局特征及其生态效应。结果表明：（1）在两种水分环境条件下，H218O在克隆植株主匍匐茎内各构件组分系列中均表现出双向传输的趋势，但更倾向于向顶传输。（2）H218O向顶传输时，在“异质高水”生境内，基部复合节根系吸收的H218O呈先增加后降低的趋势，而中部复合节根系吸收的H218O呈先降低后增加的趋势；在“均质低水”生境内，中部复合节根系吸收的H218O呈持续增加趋势。（3）在两种生境的3种引入情况下，H218O均向顶传输到尖端生长点。其中在“异质高水”和“均质低水”生境内H218O在克隆植株中向基传输过程中，传输强度整体上呈下降趋势； H218O在主匍匐茎中传输时18O分配于分株叶片中的量较多；H218O在二级匍匐茎中的传输都呈现出明显的向顶趋势，传输距离都到达了二级匍匐茎的顶端生长点。（4）在绝大多数情况下，A分株叶系列的18O丰度均明显高于B分株叶系列，这与A、B分株系列的生长发育特征相一致；但在“异质高水”生境内，中部分株吸收的H218O在二级匍匐茎中传输时，分配于B分株叶系列的18O明显高于A分株叶系列，即A分株系列相对于B分株系列的比较优势并不是一成不变的，在某些情况下还可以发生逆转。

英文摘要：

Based on tracer method,the characteristics of water physiological integration pattern and the ecological effects in the series of roots,stolons and ramet leaves of clonal plant species Zoysia japonica were studied.H218O were introduced into the roots of multiple-nodes at different growing stages.The experimental habitats were heterogeneously high and homogeneously low.（1）H218O translocation in primary stolons showed both basal and distal directions with the later as the dominance.（2）In the former HH habitat,when H218O was initially absorbed by the roots of basal and middle multiple-nodes,the translocation of H218O at distal direction showed a trend of increasing-then-decreasing and decreasing-then-increasing pattern,respectively.In the latter HL habitat,when H218O was initially absorbed by the roots of middle multiple-nodes,the translocation of H218O at distal direction showed a trend of continuous increasing.In all these conditions,the translocation of H218O at distal direction reached the apexes of the clones.（3）In both HH and HL habitats,the translocation of H218O at basal direction mainly showed a decreasing trend.When analyzing the translocation of H218O in the primary stolons in both habitats,H218O was mainly allocated to the ramet leaves.The translocation of H218O in the secondary stolons showed acropetal tendency,and H218O reached apexes of the secondary stolons.（4）H218O in A ramet leaves were usually significantly higher than those in B ramet leaves,showing consistence with the growth and development pattern of Z.japonica clone;but in HH habitat,after H218O being absorbed by the roots of middle multiple-nodes,the allocation 18O in B ramet leaves were significantly higher than those in A ramet leaves,implying that the advantages of A ramets relative to B ramets were changeable sometimes.