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在干旱地区使用航空图像和新型景观竞争指数量化灌木-灌木竞争

Robert Wojcikiewicz¹, Wenjie Ji², Niall P Hanan¹

¹Plant and Environmental Sciences Department, New Mexico State University, Las Cruces, NM, 88003, USA.

The New phytologist

|January 26, 2024

概括

干旱系统中的物种内竞争,如乔纳达盆地长期生态研究站 (JRN-LTER),很少限制蜂蜜梅斯基特的生长. 然而,当竞争的强度显著增加时,竞争确实限制了增长.

科学领域:

生态生态学生态生态学
干旱地区生态学干旱地区生态学
植物生态学植物生态学

背景情况:

种内竞争是影响植物生长和在干旱生态系统中的建立的关键因素.
了解竞争的作用对于干旱地植被的管理至关重要,特别是在半干旱草原-灌木的过渡区.

研究的目的:

开发和应用一种新的景观尺度指标,即竞争指数 (CI),以量化蜂蜜梅斯基特 (Prosopis glandulosa) 的物种内竞争强度.
在Jornada盆地长期生态研究地点 (JRN-LTER) 进行空间和时间地图CI,并评估其与灌木分布,密度和土壤类型的关系.
调查种内竞争如何影响蜂蜜梅斯基特的生长率.

主要方法:

开发了一个基于灌木分布和生长习惯的景观规模竞争指数 (CI).
在JRN-LTER中映射CI,将其与覆盖率,灌木密度和土壤类型相关联.
在不同的生理学省份分析了CI值和蜂蜜梅斯基特生长率之间的关系.

主要成果:

投资组合指标与百分比覆盖率有很强的相关性,这表明其在评估竞争中的有用性.
高强度的物种内部竞争并不普遍,这表明蜂蜜梅斯基特在大多数地区的扩张受到有限的约束.
在各个生理学省份中观察到平均CI值的差异,这些差异与地形,地形和土壤类型有关.
增长率下降和负增长率与CI增加有关,特别是当CI超过大约0.5时.

结论:

内部竞争在限制蜂蜜梅斯基特生长方面发挥着作用,但高强度竞争在JRN-LTER中并不普遍.
形条件显著影响蜂蜜梅斯基特的分布和物种内部竞争的强度.
虽然不是一个普遍的限制,但在高CI条件下,物种内竞争明显限制了蜂蜜梅斯基特的生长速度.

关键词:

普罗索皮斯 (Prosopis glandulosa) 是一种植物,它生长在状腺体中.乔纳达盆地乔纳达盆地竞争竞争竞争竞争竞争竞争干旱地区干旱地区内部特定的竞争.根区根区根区根区

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