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首页> 外文期刊>American journal of botany >Agroecosystem management for rare species of Paysonia (Brassicaceae): Integrating their seed ecology and life cycle with cropping regimens in a changing climate
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Agroecosystem management for rare species of Paysonia (Brassicaceae): Integrating their seed ecology and life cycle with cropping regimens in a changing climate

机译：常见的芸苔科（芸苔科）的农业生态系统管理：将其种子生态和生命周期与气候变化下的种植方案结合起来

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摘要

Dormancy break and germination of seeds are governed by climatic cues, and predicted changes in climate may impact the ecology and conservation of species. Paysonia perforata and P. stonensis are rare brassicaceous winter annuals occurring primarily in fields on floodplains, where corn or soybeans are recommended for habitat maintenance. We tested the effects of precipitation, based on two predictions of changes in climate, on seed germination in these two species and placed the results into a management framework. Seeds of both species, collected during peak dispersal in late April/early May, were given various periods of light (or darkness) followed by darkness (or light) at summer temperatures before placement in darkness during late summer/early autumn in both laboratory and field. The light requirement was met earliest at 10 wk (mid-July) on alternating wet/ dry substrate (simulating current climatic conditions). However, seeds of P. perforata and P. stonensis were photostimulated earliest at 2 wk (mid-May) and 6 wk (mid-June), respectively, on a continuously moist substrate (simulating predicted future conditions). The soil seed bank could be depleted if plowing coincides with photostimulation of seeds. Fields should be prepared after dispersal but before seeds are photostimulated and harvesting completed before seed germination in early September. Because seeds are highly photostimulated in late summer, disturbance from harvesting must be low to prevent burial. Cultivation of soybean, particularly for forage, is better matched to the seed biology and life cycle of Paysonia than that of corn under current and predicted climates.
机译：种子的休眠中断和萌发受气候线索的控制，预计的气候变化可能会影响物种的生态和保护。 Paysonia perforata和P. stonensis是罕见的小ic类冬季一年生植物，主要​​发生在洪泛区的田地上，建议使用玉米或大豆来维持生境。我们基于对气候变化的两种预测，测试了降雨对这两个物种种子萌发的影响，并将结果纳入管理框架。在4月下旬/ 5月上旬的峰值扩散过程中收集的这两种物种的种子在夏季和秋季分别在不同的光照（或黑暗），夏季温度和黑暗（或光照）之后，在夏末/初秋的黑暗中放置。领域。最早在7月中旬的10 wk上满足了对光的需求，在湿/干交替的基材上（模拟当前的气候条件）。然而，分别在连续潮湿的基质上（模拟预测的未来条件），分别在2 wk（5月中旬）和6 wk（6月中旬）分别对穿孔假单胞菌和斯顿假单胞菌的种子进行光刺激。如果耕作与种子的光刺激同时进行，则土壤种子库可能会耗尽。应在散布后但在光刺激种子之前准备田地，并在9月初种子发芽之前完成收获。由于种子在夏末受到高度的光刺激，因此收获时的干扰必须小以防止埋葬。在当前和预测的气候条件下，大豆的种植，特别是草料的种植，与Paysonia的种子生物学和生命周期的匹配程度比玉米更好。

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