The Soil Moisture Threshold for Emergence of Desert Economic Plant griophyllum Squarrosum

doi:10.11924/j.issn.1000-6850.casb2020-0647

Abstract

Abstract:

Emergence is the most important stage in plant growth. Determining the threshold of soil moisture during the emergence of Agriophyllum squarrosum has great significance to promote the development of wild Agriophyllum squarrosum population and its artificial planting. The pot experiment was conducted by setting temperature, sowing time and soil moisture gradients to study the changes of emergence rate of Agriophyllum squarrosum under different conditions, and to determine the suitable soil moisture content for the emergence of Agriophyllum squarrosum in aeolian sandy soil. The results showed that: (1) in laboratory, the lower limit of moisture threshold under three different temperature gradients was 10.81% (10.0 mm), 10.81% (7.5 mm) and 8.51% (7.5 mm), respectively, in outdoor, the lower limit of moisture threshold of different sowing time was 10.0 mm; (2) the water threshold for the emergence of Agriophyllum squarrosum was not only related to the periodic dormancy characteristics of seeds, but also to the ambient temperature, the higher the ambient temperature, the lower the threshold value of moisture. The study proposed the method for determining the lower limit of the moisture threshold of Agriophyllum squarrosum seedlings for the first time, which could provide basic data for the artificial planting of Agriophyllum squarrosum and the effective use of natural rainfall in the non-arable land.

Key words: Agriophyllum Squarrosum, emergence rate, soil moisture, moisture threshold, temperature, moisture content, aeolian sand soil, pot experiment

CLC Number:

Wang Qi, Ma Quanlin, Chen Fang, Wei Linyuan, Zhang Weixing. The Soil Moisture Threshold for Emergence of Desert Economic Plant griophyllum Squarrosum[J]. Chinese Agricultural Science Bulletin, 2021, 37(26): 98-104.

Figures/Tables 8

References 35

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供水方式	温度(day/night)	播种日期(月-日)	出苗初期(月-日)	出苗期天数/d	播种到出苗结束天数/d
播前掺水	15℃/15℃	6-04	6-15	4.5	15.5
	25℃/15℃	6-04	6-11	5.0	12.0
	35℃/15℃	6-04	6-09	5.5	10.5
播后喷水	15℃/15℃	6-04	6-12	6.5	14.5
	25℃/15℃	6-04	6-08	8.0	12.0
	35℃/15℃	6-04	6-08	7.0	11.0

供水方式	温度(day/night)	播种日期(月-日)	出苗初期(月-日)	出苗期天数/d	播种到出苗结束天数/d
播前掺水	15℃/15℃	6-04	6-15	4.5	15.5
	25℃/15℃	6-04	6-11	5.0	12.0
	35℃/15℃	6-04	6-09	5.5	10.5
播后喷水	15℃/15℃	6-04	6-12	6.5	14.5
	25℃/15℃	6-04	6-08	8.0	12.0
	35℃/15℃	6-04	6-08	7.0	11.0

不同水平	不同处理
不同水平	15℃/15℃	25℃/15℃	35℃/15℃
1.61%	0±0cC	0±0bB	0±0cB
6.21%	0.5±0.58cC	1.3±1.50bB	0±0cB
8.51%	1.5±1.29cC	8.0±6.78bB	11.3±7.80bB
10.81%	25.0±6.98bB	55.3±10.44aA	50.0±9.20aA
13.11%	50.3±10.34aA	61.3±13.52aA	68.0±20.78aA
15.41%	48.0±6.83aA	59.5±13.92aA	53.0±8.21aA

不同水平	不同处理
不同水平	15℃/15℃	25℃/15℃	35℃/15℃
1.61%	0±0cC	0±0bB	0±0cB
6.21%	0.5±0.58cC	1.3±1.50bB	0±0cB
8.51%	1.5±1.29cC	8.0±6.78bB	11.3±7.80bB
10.81%	25.0±6.98bB	55.3±10.44aA	50.0±9.20aA
13.11%	50.3±10.34aA	61.3±13.52aA	68.0±20.78aA
15.41%	48.0±6.83aA	59.5±13.92aA	53.0±8.21aA

不同水平/mm	不同处理
不同水平/mm	15℃/15℃	25℃/15℃	35℃/15℃
0.0	0±0cB	1.3±2.50cB	0±0cC
5.0	1.3±2.50cB	3.8±4.79cB	3.8±4.79cC
7.5	4.8±2.99cB	18.0±9.90bB	20.5±11.68bBC
10.0	28.8±11.09bA	57.5±14.43aA	56.3±16.52aAB
12.5	48.8±13.15abA	63.8±16.52aA	68.8±20.16aA
15.0	53.0±11.22aA	61.8±11.15aA	50.3±11.64aAB