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播期的选择,主要取决于大气降水与起沙风的密切配合,以培植抗风蚀的壮苗。在5月,东南风与西北风交替出现较多,有利于种子覆沙。6月开始,起沙风的频率明显下降,不利于种子覆沙。20毫米左右的连续降水对覆沙种子发芽出苗极为有利,主要集中在6月中旬以后。然而,7月上、中旬降水后长出的植株,仍具有较强的抗风蚀性;7月下旬降水后长出的植株,抗风蚀性大大减弱。因此,根据以上分析,提出踏郎、花棒的飞播日期从5月上旬到6月上旬,尤以5月中、下旬为宜。
The choice of sowing date depends mainly on the close cooperation between precipitation and the onset of wind in order to cultivate strong seedlings resistant to wind erosion. In May, southeasterly wind and northwest wind alternated more, which was good for covering sand with seeds. Beginning in June, the frequency of winds and sand drops significantly, is not conducive to seed sand cover. Continuous precipitation of about 20 mm is very beneficial to the germination and emergence of sand-covered seeds, mainly after mid-June. However, the plants grown after July and mid-July precipitation still had strong wind erosion resistance. The plants grown after precipitation in late July were greatly reduced in wind erosion resistance. Therefore, based on the above analysis, proposed skiro, Hualian flight date from early May to early June, especially in mid-May and late.