In order to explore soil grain-size characteristics under the Pinus sylvestris var. mongolica, soil samples,containing seven depths (0-200 cm), under the P. sylvestris var. mongolica were studied in three districts of Hengshan, Yuyang and Shenmu in Yulin City, Shaanxi Province. We measured the physical component of soil grain and analyzed the soil grain size parameters. Results show that:(1) Soil grain size are mainly occupied by fine sand (34.73%-44.57%) and middle sand (40.63%-50.28%), and the coarser sediment content (0.27%-1.34%) is the lowest under P. sylvestris var. mongolica plantations in the southeast Mu Us Sandy Land. (2) The mean grain size of the soil ranges from fine sand to middle sand (1.81-2.20Φ), the sorting coefficient ranges from better sorting to middle sorting (0.63-0.76), the skewness ranges from near symmetrical to positive bias (0.03-0.13), and the kurtosis is medium (0.94-1.07). (3) In space,the mean grain size of the soil at the depth of 0-200 cm becomes fine gradually and shows significant difference from the northeast to the southwest; while for other soil grain size parameters, no uniform rule exist for the soil at the depth of 0-60 cm, but the soil at the depth of 60-200 cm have a uniform and non-significant rule, which contains that the worse sorting, the increased fine particles,and the narrowed grain size frequency curve from the northeast to the southwest. In depth,there is no uniform rule for the soil grain size parameters at the depth of 0~200 cm. However, in comparison to the soil of 0-30 cm, the soil of 30-60 cm has the finer mean grain size, the worse sorting,finer particle and the narrower grain size frequency curve. (4) The interaction between the plant and the soil is significant at the depth of 0-30 cm compared with other depths.
[1] 段民福.毛乌素沙地榆林沙区樟子松人工林土壤理化性质时空变异规律研究[D].陕西杨凌:西北农林科技大学,2012.
[2] 朱教君,范志平,曾德慧,等.不同起源沙地樟子松林结构与生长比较研究[J].林业研究,2003,14(2):103-111.
[3] Jiang F Q,Zhu J J,Zeng D H,et al.Management for Protective Plantations[M]. Beijing:China Forestry Publishing House,2003.
[4] 高崇华,李志忠,付强.毛乌素沙地引种樟子松调查报告[J].内蒙古林业科技,1996(1):29-32.
[5] 王彦武,廖超英,徐恒.毛乌素沙地固沙林土壤物理性状研究[J].西北林学院学报,2008,23(3):36-39.
[6] 王怀彪,潘鹏,高保山.毛乌素沙地樟子松抗旱造林关键技术研究[J].西北林学院学报,2009,24(6):70-73.
[7] 吴祥云,刘广,韩辉.不同类型樟子松人工固沙林土壤质量的研究[R].中国林学会青年学术年会,2003.
[8] 牛沙沙,周永斌,刘丽颖,等.不同林龄樟子松人工林土壤理化性质[J].东北林业大学学报,2015,43(2):47-50.
[9] 苑增武,张庆宏,张延新,等.不同密度樟子松人工林土壤水分变化规律[J].吉林林业科技,2000,29(1):1-4.
[10] 冯伟,杨文斌,党宏忠,等.不同密度樟子松固沙林土壤水分特征[J].水土保持通报,2015,35(5):189-194.
[11] 张锦春,汪杰,李爱德,等.樟子松根系分布特征及其生长适应性研究[J].防护林科技,2000(3):46-49.
[12] 苏芳莉,刘明国,郭成久,等.沙地樟子松根系垂直分布特征及对土壤的影响[J].中国水土保持,2006(1):20-22.
[13] 王凯,宋立宁,吕林有,等.不同林龄沙地樟子松人工林细根垂直分布特征[J].东北林业大学学报,2014,42(3):1-4.
[14] 王新星,赵国平,史社强,等.陕西榆林樟子松细根分布特征[J].东北林业大学学报,2014,42(10):16-19.
[15] 朱美云,田有亮,郭连生.不同气候湿度下樟子松耐旱生理特征的变化[J].应用生态学报,1996,7(3):250-254.
[16] 曾德慧,陈广生,陈伏生,等.不同林龄樟子松叶片养分含量及其再吸收效率[J].林业科学,2005,41(5):21-27.
[17] 朱教君,康宏樟,李智辉.不同水分胁迫方式对沙地樟子松幼苗光合特性的影响[J].北京林业大学学报,2006,28(2):57-63.
[18] 马成忠,邓继峰,丁国栋,等.不同初植密度樟子松人工林对毛乌素沙地南缘土壤粒度特征的影响[J].水土保持学报,2017,31(1):230-235.
[19] 吴永胜,尹瑞平,何京丽,等.毛乌素沙地南缘沙区水分入渗特征及其影响因素[J].干旱区研究,2016,33(6):1318-1324.
[20] 程杰,韩霁昌,王欢元,等.毛乌素沙地砒砂岩固沙机理研究[J].水土保持学报,2016,30(5):124-127.
[21] 崔徐甲,孙虎,董治宝,等.巴丹吉林沙漠高大沙山湿沙层水分特征[J].中国沙漠,2017,37(2):214-221.
[22] 原翠萍,张心平,雷廷武,等.砂石覆盖粒径对土壤蒸发的影响[J].农业工程学报,2008,24(7):25-28.
[23] 符超峰,赵景波.毛乌素沙地东南缘不同类型沙丘土壤水分分布特征[J].干旱区研究,2011,28(3):377-383.
[24] 赵晓彬.樟子松造林密度与沙层水分的关系研究[J].防护林科技,2004(5):4-5.
[25] 郜超,王建梅,孙婧瑜.榆林沙区水分变化与植被演替的关系[J].防护林科技,2015(5):97-99.
[26] 申卫博.毛乌素沙地东南缘湿地退化演变机理[D].陕西杨凌:西北农林科技大学,2013.
[27] 成都地质学院陕北队.沉积岩(物)粒度分析及其应用[M].北京:科学出版社,1978.
[28] Folk R L,Ward W C.Brazos River bar:a study in the significance of grain size parameters[J].Journal of Sedimentary Research,1957,27(1):3-26.
[29] 董治宝,苏志珠,钱广强,等.库姆塔格沙漠风沙地貌[M].北京:科学出版社,2011.
[30] 李占宏,海春兴,丛艳静.毛乌素沙地表土粒度特征及其空间变异[J].中国水土保持科学,2009,7(2):74-79.
[31] 霍文,何清,杨兴华,等.中国北方主要沙漠沙尘粒度特征比较研究[J].水土保持研究,2011,18(6):6-11.
[32] 李智佩,岳乐平,薛祥煦,等.毛乌素沙地沉积物粒度特征与土地沙漠化[J].吉林大学学报:地球科学版,2007,37(3):578-586.
[33] 冯伟.毛乌素沙地东北缘土壤水分动态及深层渗漏特征[D].北京:中国林业科学研究院,2015.
[34] 杨梅焕,朱志梅,曹明明,等.毛乌素沙地东南缘不同沙漠化阶段土壤-植被关系研究[J].西北农林科技大学学报:自然科学版,2010,38(5):181-187.
[35] 符超峰,赵景波,卞子浩,等.毛乌素沙地西北缘不同类型沙丘土壤水分分布特征[J].西安科技大学学报,2015,35(4):426-435.
