Spatiotemporal dynamics of the clone of white clover in a grazed sward

放牧草地中白三叶草克隆的时空动态

• 批准号: 08660329
• 负责人: SAWADA Hitoshi
• 金额: $ 1.47万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08660329/
• 关键词: White clover; Grazed sward; Spatiotemporal dynamics; Clonal plant; Clonal growth; Clonal reproductive ecology; Defoliation stress; Clone identification

Spatiotemporal dynamics of a single clone of white clover was examined in a grazed sward. Firstly, new techniques were developrd to measure and describe the clonal growth of white clover. Using the techiques, clonal growth of the target clone was monitored for two years in a perennial ryegrass-white clover sward. Following results were obtained : (1) The clone spreaded widely in summer to late-autumn but decreased its size in winter to early-summer. This depression was due to the thawing-frosting cycle. (2) Fragmentation of the clone occurred in winter to early-spring. Modules with roots and branches were likely to be sites for the separation. (3) Crush phenomenon was observed. (4) Branching strategy was found out. (5) The extent and pattern of defoliation by cattle were assessed. Number of healthy leaves which were not eaten was small. They placed near around the apex of stolons. (6) In an intensively grazed sward, defoliation stress to white clover clones was uniformly severe.(7) Defoliation stress gives them heavy damage and promotes the changes in size, resulting in high mortality risk.

在放牧草地上研究了白三叶单株无性系的时空动态。首先，开发了测量和描述白三叶克隆生长的新技术。利用这些技术，在多年生黑麦草白色三叶草草地上对目标克隆的克隆生长进行了两年的监测。结果表明：(1)该无性系在夏季至秋末分布较广，但在冬季至初夏其体型较小。这种凹陷是由于融化-结霜循环造成的。(2)无性系的碎片化发生在冬季至早春。有根和有枝的模块很可能是分离的部位。(3)观察到挤压现象。(4)找出了分枝策略。(5)评价了黄牛落叶的程度和方式。未被食用的健康叶片数量较少。它们围绕着匍匐茎的顶端放置。(6)在集约化放牧草地上，白三叶无性系的落叶胁迫一致严重。(7)落叶胁迫对白三叶无性系危害较大，并促进其大小的变化，具有较高的死亡风险。

项目成果

SAWADA,Hitoshi: "Variation in architectural and clonal growth traits within the seed population of white clover (Trifolium repens L.) in a Trifolium repens-Zoysia japonica sward." Grassland Science. 42 (3). 202-210 (1996)

SAWADA,Hitoshi：“白三叶草 - 结缕草草丛中白三叶草 (Trifolium repens L.) 种子群体结构和克隆生长性状的变化。”

ISHIKAWA,Mariko: "Benefits from physiollgical integration in white clover : the assessment in grazed sward." Grassland Science. 43 (Sup.). 52-53 (1997)

石川真理子：“白三叶草生理整合的益处：放牧草地的评估。”

荻ノ迫 善六: "日本国内のシロクローバ自生集団におけるシアン生成の緯度的及び高度的クライン" Grassland Science. 42(3). 242-246 (1996)

Zenroku Oginosako：“日本野生白三叶草种群氰产生的纬度和海拔梯度”《草原科学》42（3）242-246（1996）。

Sawada,H.: "Variation in architectural and clonal growth traits within the seed population of white clover (Trifolium repens L.) in a Trifolium repens-Zoysia japonica sward." Grassland Science. 42(3). 202-210 (1996)

Sawada, H.：“白三叶草 - 结缕草草丛中白三叶草 (Trifolium repens L.) 种子群体结构和克隆生长性状的变化。”

OGINOSAKO,Zenroku: "Latitudinal and altitudinal clines for cyanogenesis in naturalized populations of white clover (Trifolium repens L.) in Japan." Grassland Science. 42 (3). 242-246 (1996)

OGINOSAKO，Zenroku：“日本白三叶草（Trifolium repens L.）归化种群中氰化的纬度和海拔梯度。”