干旱区生态环境知识资源中心(Arid): 几种生态因子对红砂和霸王种子萌发与幼苗生长的影响

Arid

	几种生态因子对红砂和霸王种子萌发与幼苗生长的影响
其他题名	Study on the effects of soil temperature, soil moisture content, sowing depth, and sand cover on seed germination and seedling growth of Reaumuria soongorica and Zygophyllum xanthoxylum
	曾彦军 1; 王彦荣 1; 保平 2; 塔拉腾 2; 苏勒德 2
来源期刊	草业学报
ISSN	1004-5759
出版年	2005
卷号	14 期号:5 页码:24-31
中文摘要	自然条件下进行了土壤温度、水分、播深及覆沙地境对红砂和霸王种子萌发与幼苗生长的效应研究,结果显示,模拟阵雨期(人工洒水)覆沙和未覆沙试验小区白天播种层土壤温度均较高,尤其中午(14:00)覆沙小区1和4 cm播种层土壤温度平均值分别高达43.2和37.3℃,未覆沙小区分别高达38.0和33.6℃.高温引发种子次生休眠是该期红砂和霸王种子不能萌发的主要原因.而且播种层土壤含水量日内下降十分明显,其中覆沙和未覆沙小区1 cm土层平均土壤含水量下降至0.11%和2.62%,也会引发种子产生次生休眠,成为红砂和霸王种子不能萌发的另一原因.自然连续降水期2种试验小区播种层平均土壤温度适宜,播种层土壤含水量高而稳定,满足了红砂和霸王种子萌发的适宜温度和较高水势的条件.因此,在干旱荒漠区进行荒漠草地的人工辅助建植,需要依靠连续性降水过程.自然条件下霸王发芽率最高的播深处理在覆沙小区为2 cm、未覆沙小区为1 cm;在2种试验小区内霸王幼苗生物量最大的播深处理均为2和3 cm.覆沙较未覆沙地境有利于霸王种子萌发和幼苗的生长.播种当年霸王地上生物量为红砂的75～117倍.
英文摘要	Reaumuria soongorica and Zygophyllum xanthoxylum are important ultra-xenomorphic shrubs in the northwest arid desert region of China. In 2001, seeds of the two species were collected at maturity in the Alshan Region,Inner Mongolia,and kept at -5°C until use. Study on the effects of soil temperature,soil water content, sowing depth and sand cover on seed germination and seedling growth for the two shrubs was conduc-ted in their native habitats. The results showed that during a simulating shower period (manned shower), the average soil temperatures of the sowing layers were too high for seed germination, This was especially so at noon, where the average temperatures at the soil depths of 1 and 4 cm sowing layer in the sand covered and non-sand covered plots were 43. 2,37. 3°C and 38. 0,33. 6°C respectively. These high-temperatures,which could have lead to secondary seed dormancy, were the primary reason for seeds not germinating. Further, the soil water contents of sowing layers reduced acutely. This finding was especially so for soil water contents in the 1 cm so-wing layer treatments of the two plots, where it decreased to 0. 11% and 2. 62%, and could also have been a cause for secondary seed dormancy,also leading to seeds not germinating. However during the continual nature raining period, the soil temperatures of the sowing layers were as expected, with the soil water contents of the sowing layers high and sustainable. As such, the basic conditions of seed germination of the two shrubs were met in this period. Thus,the accessorial sowing planting in arid desert region must depend upon continual rain-fall. The highest seedling emergence percentage for Z. xanthoxylum was obtained in 2 cm sowing depth treat-ment in the sand covered plot,and was obtained in 1 cm sowing depth treatment in the non-sand covered plot. The highest above biomass for the Z. xanthoxylum seedling was obtained at the 2 and 3 cm sowing depths in both lrail plots. Comparatively, the sand covered plots had an advantage for Z. xanlhuxylum seed germination and seedling growth over the non-sand covered plots. In the first growing year, the above biomass of Z. xan-thoxylum was significantly higher than that of R. soongurica ( P < 0. 01),where it had 75~117 times of the bi-omass to R. soongorica.
中文关键词	土壤温度 ; 土壤水分 ; 播深 ; 覆沙地境 ; 萌发 ; 幼苗生长
英文关键词	soil temperature soil water content sowing depth sand covered plot germination seedling growth
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRONOMY
WOS研究方向	Agriculture
CSCD记录号	CSCD:2033332
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/205965
作者单位	1.兰州大学草地农业科技学院, 兰州, 甘肃 730020, 中国; 2.内蒙古阿拉善盟草原站, 巴彦浩特, 内蒙古 750360, 中国
推荐引用方式 GB/T 7714	曾彦军,王彦荣,保平,等. 几种生态因子对红砂和霸王种子萌发与幼苗生长的影响[J]. 兰州大学,2005,14(5):24-31.
APA	曾彦军,王彦荣,保平,塔拉腾,&苏勒德.(2005).几种生态因子对红砂和霸王种子萌发与幼苗生长的影响.草业学报,14(5),24-31.
MLA	曾彦军,et al."几种生态因子对红砂和霸王种子萌发与幼苗生长的影响".草业学报 14.5(2005):24-31.