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中国农学通报 ›› 2021, Vol. 37 ›› Issue (14): 116-122.doi: 10.11924/j.issn.1000-6850.casb2020-0584

所属专题: 资源与环境 农业气象

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

甘南合作地区牧草生长季土壤水分气候变化特征

宁和平1(), 刘丽1, 栾振斌2, 罗王军3   

  1. 1陇南市气象局,甘肃武都746000
    2陇南市宕昌县气象局,甘肃宕昌746500
    3甘南藏族自治州气象局,甘肃合作747000
  • 收稿日期:2020-10-23 修回日期:2021-03-04 出版日期:2021-05-15 发布日期:2021-05-19
  • 作者简介:宁和平,男,1976年出生,甘肃舟曲人,高级工程师,主要从事短期天气预报及气候与生态方面研究。通信地址:746000 甘肃省陇南市气象局,E-mail: gs_hping@163.com
  • 基金资助:
    中国气象局气候变化专项“甘肃省气候变化监测公报”(CCSF201516)

Climate Change Characteristics of Soil Moisture in Forage Growing Season in Hezuo of Gannan Plateau

Ning Heping1(), Liu li1, Luan Zhenbin2, Luo Wangjun3   

  1. 1Longnan Meteorological Bureau of Gansu Province, Gansu Wudu 746000
    2Tanchang County Meteorological Bureau of Gansu Province, Gansu Tanchang 746500
    3Gannan Meteorological Bureau of Gansu Province, Gansu Hezuo 747000
  • Received:2020-10-23 Revised:2021-03-04 Online:2021-05-15 Published:2021-05-19

摘要:

通过对甘肃甘南高原合作地区1994—2013年牧草生长季(4—9月)人工观测土壤重量含水率变化特征分析,用线性趋势、突变分析等方法分析其变化趋势,表明近20年来合作地区牧草生长季土壤湿度呈增加的趋势,其中以浅层10 cm增湿的趋势最为明显。随着深度的增加,土壤湿度呈递减的趋势。在季节变化上,整层土壤湿度在6月中旬、8月中旬呈低值区,7月中、下旬及9月份为高值区;年际变化上,近20年来,合作地区牧草生长季土壤湿度总体上呈现出上升趋势。突变分析表明,合作地区20 cm、40 cm土壤湿度均出现了升高突变;合作地区夏季土壤湿度与夏季平均气温及降水量均呈正相关,其中与降水量的相关性最为显著。牧草生长期各月的牧草生物量与前期土壤水分有较密切的关系,总体上,土壤水分对牧草产量有一定的正贡献作用。

关键词: 甘南合作地区, 亚高山草甸, 牧草, 土壤水分, 变化特征

Abstract:

Based on the soil moisture data which were observed in forage growing season (April to September) in Hezuo of Gannan, Gansu Province from 1994-2013, we analyzed the depth variation characteristics of soil moisture in the area. The results show that the soil moisture in Hezuo exhibits an increasing trend during forage growing season, especially in the surface layer of 10 cm. And the trend weakens as the depth increases. In terms of seasonal change, the soil moisture of the whole layers is low in mid-June and mid-August, and high in mid-July, late July and September. The mutation detection analysis indicates that the moisture of both 20cm and 40cm soil layer in Hezuo present a jump increase. Soil moisture during summer is positively correlated with summer air temperature and precipitation in Hezuo, and the correlation with precipitation is more significant, showing a good consistency in the variation trend. The biomass of forage in each month in the growing season is closely related to previous soil moisture, which means that the soil moisture has positive contribution to forage yield.

Key words: Gannan Hezuo, subalpine meadow, forage grass, soil moisture, variation characteristics

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