摘要
利用黑龙江省1981—2010年的土壤湿度数据,以富锦县、龙江县、双城县、黑河市、海伦县为代表点,分析了黑龙江省东、西、南、北、中各区域封冻前(11月8日)0～30cm土层土壤湿度的趋势变化和干湿变化,采用线性趋势、5年滑动平均和Mann-Kendall法检验变化趋势,利用Mann-Kendall和Yamamoto法对土壤湿度变化趋势进行突变点检验。结果表明:封冻前0～30cm土层各地土壤湿度在30年间均有不同程度下降,西部龙江县下降剧烈,中部海伦县较剧烈,北部黑河市和南部双城县次之,上述代表点20cm土层土壤湿度下降均达到了P<0.05以内的显著水平,东部富锦县下降趋势最弱;经Mann-Kendall法检验,0～30cm土层龙江县、海伦县土壤湿度出现了下降的突变区域,其余代表点的土壤湿度变化趋势在近几年中逐渐接近或已经超越了显著线;1994年是龙江县10cm、20cm土壤湿度下降的突变时期;黑龙江省各地土壤湿度的下降与封冻前一段时期内气温和降水变化密切相关,还与土壤物理性质的恶化等因素有关。
By using the soil moisture data of Heilongjiang Province from 1981 to 2010, selecting the FUjin county of the east, Longjiang county of the west, Shuangcheng county of the south, Heihe city of the north, and Hailun county of the middle in Heilongjiang province, the trends of soil moisture during winter and the drought-wet change are analyzed, and the significance tests are conducted with three methods： linear trend, 5-year moving average, and Mann-Kendall. The mutation test of soil moisture change is made with Mann-Kendall and Yamamoto methods. The results show that the soil moisture at the depth of 0 to 30 cm underground showed various downtrend in the last 30 years： the decreasing of the soil moisture at the Longjiang county was the sharpest, Hailun county the second, and Heihe city and Shuangcheng county the next; moreover, the significance level~ of soil moisture decreasing at 20 cm for all the stations were lest than 0.05, but the decreasing at Fujin county was slight. The results of the Mann-Kendall test show that there appeared mutational zones in Longjiang and Hailun counties, and the downtrends of the other stations were close to, or exceeded the significant level in the recent years. The mutational time of soil moisture change was 1994 for the soil layer of 0 to 20 cm in Longjiang county. The decreasing of winter soil moisture in Heilongjiang Province is related to temperature and precipitation, as well as the deterioration of the soil physical properties.
出处
《气象科技》
2013年第1期196-201,共6页
Meteorological Science and Technology
基金
公益性行业气象专项(GYHY201106026)
科技部农业科技成果转化资金项目(2010GB24160651)资助
关键词
黑龙江
土壤湿度
变化趋势
Heilongjiang, soil moisture, tendency
