黑果枸杞(Lycium ruthenicum)和沙蒿(Artemisia desertorum)种子出苗和幼苗生长对沙埋的响应

Response of Sand Buried Depth on Seed Emergence and Seedling Growth of Lycium ruthenicum and Artemisia desertorum

通过室内试验测定了黑果枸杞(Lycium ruthenicum)和沙蒿(Artemisia desertorum)两种荒漠植物的种子生理特征以及沙埋厚度(0、1、2、3、4、5 cm)对其种子出苗及幼苗生长的影响。结果表明:两种植物均为荒漠灌木,黑果枸杞种子千粒重大于沙蒿,自然状态下沙蒿种子萌发率较大。随着沙埋厚度增加,两种植物种子出苗率下降、首次出苗时间延迟;幼苗生长方面,黑果枸杞和沙蒿分别适宜于1~2 cm、0~1 cm的浅层沙埋,均在沙埋厚度5 cm时种子几乎不萌发。在荒漠区采用这两种植物进行植被恢复时,除考虑种子自身性状外,还应充分考虑当地的沙埋、降雨等条件,以提高出苗率、增大幼苗定植率。

The seed physiological characteristics and the effects of sand burial depth on seedling emergence and seedling growth (0, 1, 2, 3, 4, 5 cm) of the two desert plants (Lycium ruthenicum, Artemisia desertorum) were determined by laboratory experiments. The results showed that both plants were desert shrubs, and the seed weight of Lycium ruthenicum was higher than that of Artemisia desertorum, and the seed germination rate of Artemisia desertorum was higher in natural state. With the increase of sand burial depth, the seed emergence rate was decreased and the first seed-ling emergence time was delayed of two plants. In terms of seedling growth, the L. ruthenicum and A. desertorum were suitable for shallow sand burial of 1~2 cm and 0~1 cm respectively, the seeds hardly germinated when were buried at 5 cm depth;In order to increase the emergence rate and the seedling planting rate, the seed characteristics will be considered and the local conditions such as sand burial and rainfall also should be taken into full consideration for vegetation restoration in desert areas.