河西走廊天然胡杨林的分布和更新特征及其与土壤因子的关系

doi:10.13866/j.azr.2023.02.07

Abstract

Abstract:

A thorough investigation of the distribution of natural Populus euphratica, tree growth, regeneration characteristics, soil types, and factors in the Hexi Corridor was conducted. The distribution and regeneration status of natural P. euphratica in the Hexi Corridor, as well as its relationship with soil factors, were then examined. The results showed that: (1) Natural P. euphratica forests in the Hexi Corridor were mainly distributed in riparian terraces, ancient river terraces and the edge of oasis cultivated land in the lower reaches of Shule River, Black River, and Shiyang River. There are four main types of forest land: abandoned land, the land around cultivated fields and irrigation canals, land along the current river course, and land among ancient river course and Gobi low-lying land. (2) The growth status, age structure, and seedling regeneration of P. euphratica in the land around cultivated fields and irrigation canal, land along the current river course are better than those of the abandoned land, and among ancient river course and Gobi low-lying land. In terms of the number of renewed seedlings per unit area, the land around the cultivated field and irrigation canal was the largest, with an average value of 22.13, followed by abandoned cultivated land (20.92), land along the current river course (10.50), and among ancient river course and Gobi low-lying land (1.33). (3) Different types of P. euphratica forests have different soil factor contents: (i) Available P: In the 0-20 cm soil layer, the soil available phosphorus showed the trend as; land along the current river course < land among ancient river course and Gobi low-lying land < abandoned land, land around cultivated field and irrigation canal cultivated land; in the 20-40 cm soil layer, land along the current river course had significant less available phosphorus than the other three types of forest land (all P < 0.05); (ii) Moisture content was higher in the land around cultivated fields and irrigation canals, and land along the current river course than in abandoned land, land among ancient river course and Gobi low-lying land (all P < 0.05); (iii) In comparison to the other three types of forest land, abandoned land has significantly lower soil conductivity between the 0-20 cm and 20-40 cm soil layers (P < 0.05). There was no significant difference in the contents of total N and organic matter among different types of forest land (P > 0.05) and in the 40-60 cm soil layer, land among the ancient river course and Gobi low-lying land was significantly higher (P < 0.05). Except for the coarse sand in the 0-20 cm soil layer, the soil clay particles, silt particles, and coarse particles in the land around the cultivated field and irrigation canal performed significantly higher than those in the other three types of forest land (P < 0.05). (4) The contents of soil moisture and available P were positively correlated with the middle and young age of P. euphratica and the number of seedlings (P < 0.05). (5) To encourage the sustainable development of P. euphratica forest, improve forest management and protection, timely thinning, removal of branches and dieback, thinning, and irrigation.

Key words: Hexi Corridor, natural Populus euphratica, distribution renewal, soil factor

MA Junmei,MA Jianping,MAN Duoqing,GUO Chunxiu,ZHANG Yunian,ZHAO Peng,WANG Fei,LI Yuanxing. Distribution and regeneration characteristics of natural Populus euphratica forests in Hexi Corridor and their relationship with soil factors[J].Arid Zone Research, 2023, 40(2): 224-234.

Figures/Tables 5

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胡杨林类型	林地特征描述	主要植物种类	盖度/%
弃耕地林地	绿洲内原耕地，周围有胡杨树，因客观原因放弃耕种后胡杨在弃耕地内自然繁殖而形成的林地	二白杨、沙枣、柽柳、白刺、枸杞、黑果枸杞、甘草、宽叶独行菜、骆驼蓬、骆驼蒿、盐生草、黄花矶松、芦苇、苦豆子、沙拐枣、芨芨草、赖草、乳苣、猪毛菜、五星蒿、蝶果虫实、鹅绒藤、沙米	31.67
耕地及灌渠周围林地	绿洲内耕地、灌溉水渠周围生长不同龄级胡杨的林地	二白杨、新疆杨、榆树、沙枣、柽柳、梭梭、枸杞、黑果枸杞、白刺、沙拐枣、红砂、花花柴、苦豆子、盐生草、芨芨草、盐爪爪、甘草、芦苇、赖草、驼蹄瓣、猪毛菜、五星蒿、黄花矶松、骆驼蓬、骆驼蒿、田旋花、灰绿藜、乳苣、蒙古鸦葱、鹅绒藤、甘青铁线莲	45.91
现河道沿岸林地	各流域现水流汇集、径流、生长不同龄级胡杨的地带，有山坡地、河岸、河漫滩地等	柽柳、枸杞、黑果枸杞、骆驼刺、大叶白麻、珍珠猪毛菜、合头草、灌木亚菊、红花岩黄耆、河西菊、芨芨草、甘草、芦苇、猪毛菜、五星蒿、盐生草、甘青铁线莲、骆驼蓬、苦豆子、驼蹄瓣、灰绿藜、虎尾草、狗尾草、针茅、赖草	40.50
古河道及戈壁低洼地林地	因水量减少或河流改道，已多年没有水径流，但仍生长有胡杨的地域，如老河道、尾闾荒漠、戈壁低洼滩地等	柽柳、白刺、黑果枸杞、骆驼刺、大叶白麻、盐爪爪、花花柴、甘草、猪毛菜、盐生草、五星蒿、驼蹄瓣、黄花矶松、芦苇、芨芨草、乳苣、蝶果虫实、沙米、沙蒿	39.70

胡杨林类型	各龄级株数/株			幼苗株数/株	胡杨长势
胡杨林类型	C	Z	Y	幼苗株数/株	胡杨长势
弃耕地林地	7.83±4.28	12.17±4.91a	19.67±4.91b	20.92±2.82c	整体生长弱，枯枝枯梢现象明显，尤其退耕年限较长的
耕地及灌渠周围林地	19.38±3.71	42.50±4.25b	26.75±4.25b	22.13±2.449c	大部分生长正常，成熟龄以上的树木有枯枝枯梢现象
现河道沿岸林地	19.80±3.32	22.50±3.80a	19.30±3.81b	10.50±2.18b	大部分生长正常，成熟龄以上的树木有枯枝枯梢现象
古河道及戈壁低洼地林地	13.89±3.50	14.89±4.01a	3.33±4.01a	1.33±2.30a	树木整体生长弱，枯枝枯梢现象严重。

土层/cm	胡杨林类型	速效P /（mg·kg^-1）	全N /（g·kg^-1）	有机质 /（g·kg^-1）	含水率/%	电导率 /（μS·cm^-1）
0~20	弃耕地林地	20.64±3.80c	0.26±0.70	4.80±2.06	0.80±1.93a	310.8±1135.0a
	耕地及灌渠周围林地	21.99±3.10c	0.59±0.57	11.70±1.68	6.20±1.58b	3571.0±983.0b
	现河道沿岸林地	8.18±2.94a	0.42±0.54	6.55±1.59	3.70±1.50ab	2942.8±879.0b
	古河道及戈壁低洼地林地	11.95±3.10b	1.38±0.57	7.67±1.68	0.96±1.58a	4042. 6±927.0b
20~40	弃耕地林地	13.79±8.33b	0.20±0.90	4.30±2.27	1.13±2.89a	282.0±973.0a
	耕地及灌渠周围林地	13.58±8.63b	0.47±0.73	8.92±1.85	8.89±2.36b	2254.0±843.0b
	现河道沿岸林地	5.06±3.32a	0.39±0.70	6.81±1.76	5.48±2.24b	1646.0±754.0b
	古河道及戈壁低洼地林地	11.41±6.02b	1.67±0.73	7.07±1.85	1.58±2.36a	3773.0±794.0b
40~60	弃耕地林地	8.42±2.16	0.13±0.39	2.93±1.75	1.30±2.18	233.0±1376.0a
	耕地及灌渠周围林地	8.00±1.76	0.32±0.32	5.88±1.43	6.99±1.78	1300.0±1192.0b
	现河道沿岸林地	4.15±1.67	0.31±0.30	5.09±1.35	4.97±1.69	1372.0±1066.0b
	古河道及戈壁低洼地林地	7.35±1.76	0.84±0.32	6.70±1.43	2.04±1.78	5169.0±112.04c

土层/cm	胡杨林地类型	黏粒 <0.002 mm	粉粒 0.002~0.02 mm	细沙粒 0.02~0.2 mm	粗沙粒 0.2~2 mm
0~20	弃耕地林地	1.83±0.79a	7.13±3.65a	46.41±7.91	44.64±9.48
	耕地及灌渠周围林地	6.58±0.68b	27.85±3.16b	46.19±6.85	19.38±8.21
	现河道沿岸林地	1.76±0.61a	8.00±2.83a	49.70±6.13	40.54±7.34
	古河道及戈壁低洼地林地	1.28±0.65a	6.59±2.98a	54.65±6.46	37.48±7.74
20~40	弃耕地林地	1.25±0.76a	5.59±3.68a	42.46±7.20	50.70±8.71b
	耕地及灌渠周围林地	7.71±0.66b	31.06±3.18b	46.56±6.23	14.66±7.55a
	现河道沿岸林地	2.08±0.59a	9.92±2.85a	51.82±5.58	36.19±6.75b
	古河道及戈壁低洼地林地	2.00±0.62a	9.33±3.00a	51.90±5.88	36.77±7.11b
40~60	弃耕地林地	1.35±0.98a	5.41±4.17a	38.84±8.25	54.42±9.14b
	耕地及灌渠周围林地	6.80±0.85b	26.62±3.61b	52.69±7.14	13.90±7.91a
	现河道沿岸林地	1.87±0.76a	8.48±3.23a	45.38±6.39	44.27±7.08b
	古河道及戈壁低洼地林地	1.61±0.80a	7.78±3.40a	49.57±6.73	41.04±7.46b

胡杨龄级	土壤速效P	土壤全N	土壤pH	土壤有机质	土壤含水率	土壤电导率
成熟龄	0.081	0.065	-0.019	-0.130	-0.198	0.039
中龄	0.458^**	0.023	-0.277^**	0.015	0.260^**	0.199^*
幼龄	0.408^**	-0.090	-0.186	-0.052	0.295^**	0.149
幼苗	0.415^*	-0.115	-0.105	0.188	0.353^**	0.047

Distribution and regeneration characteristics of natural Populus euphratica forests in Hexi Corridor and their relationship with soil factors

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