摘 要

（1）在土壤含水量方面，整体而言，MH（黄金柳 墨西哥柏）林带的土壤含水量最高，而且随着土层厚度的改变而降低。其次是MN（大叶女贞 墨西哥柏）林带、MN（大叶女贞 墨西哥柏）林带。

（2）5种混交林带的种植可以有效地降低土壤PH值，对盐碱地有改良效果。5种混交林带土壤PH值的规律大致表现为下层gt;中层gt;表层。

（3）在土壤全盐量方面，在0-10cm土层，MX（紫薇 墨西哥柏）林带土壤全盐量最低，其次是MN（大叶女贞 墨西哥柏）林带和ML（栾树 墨西哥柏）林带。而且20-30cm土层含盐量都高于0-10cm土层、10-20cm土层。

（4）在土壤磷含量方面，随着土层深度的增加，5种林带土壤全磷量和有效磷含量逐渐降低。在0-10cm土层，MK（苦楝 墨西哥柏）林带全磷含量最高，其次是MX（紫薇 墨西哥柏）林带和ML（大叶女贞 墨西哥柏）。在0-10cm土层，MX（紫薇 墨西哥柏）林带有效磷含量最高，其次是MH（黄金柳 墨西哥柏）林带，MK（苦楝 墨西哥柏）林带。

关键词：林带；土壤含水量；土壤PH；土壤全盐量；土壤磷含量

Study on soil nutrient of different forest restoration patterns in Lianyungang XuWei District

Abstract:In this paper, five different forest belts under the condition of Xuwei New Area in Lianyungang were studied. The soil organic matter, water content, pH and total salt were studied. The main findings are as follows:

(1) In the case of soil water content, the soil moisture content of MH (yellow willow Mexican cypress) is the highest, and decreases with the thickness of soil layer. Followed by the MN (large leaf privet Mexican cypress) forest, MN (large leaf privet Mexican cypress) forest belt.

(2) The planting of 5 mixed forest belts can effectively reduce the soil pH value, and improve the effect of saline soil. The soil pH values ​​of the five mixed forest belts were mainly lower layergt; middle layergt; surface layer.

(3) In the soil total salt content, in the 0-10cm soil layer, MX (Lagerstroemia indica forest) forest soil total salt content is the lowest, followed by MN (large leaf privet Mexican cypress) forest and ML (Koelreuto Mexico Cypress) forest belt. And 20-30cm soil salt content are higher than 0-10cm soil layer, 10-20cm soil layer.

(4) In the aspect of soil phosphorus content, the soil total phosphorus content and available phosphorus content decreased gradually with the increase of soil depth. In the 0-10 cm soil layer, MK (Melia azalea Mexican cypress) forest with the highest total phosphorus content, followed by MX (Lagerstroemia Mexican Cypress) forest and ML (large leaf privet Mexican cypress). In the 0-10cm soil layer, MX (Lagerstroemia indica Mexican cypress) forest with the highest phosphorus content, followed by MH (Golden Willow Mexican Park) forest, MK (Melia azeda Mexican Park) forest.This article takes five different forest-belts at lianyungang XuWei District as the research object to study soil organic matter, water content, PH, salt and other indexes.We sampled according to the soillayers and removed plant residues,gravel,etc.The results show that different forest-belts on sample have different effects in the soil nutrient content,having certain improvement effect on the alkaline soil.Key words:Forest belts; soil water content; soil pH; soil total salt content; soil phosphorus content.

目 录

1. 引言 1

1.1研究目的与意义 1

1.2国内外研究状况 1

1.2.1盐碱土的特征与危害………………………………………………………………… 1

1.2.2 植物对盐碱土的改良作用………………………………………………………… 2

1.2.3盐碱土的特征与危害……………………………………………………………… 3

2.试验材料与方法 4

2.1 试验材料 4

2.2试验药品与仪器 5

2.3土壤PH值测定法-电位法 6

2.4土壤有效磷的测定碳酸氢钠提取—钼锑抗比色法(olsen法) 7

2.5土壤含水量测定法-称重法  8

2.6土壤全盐量测定方法-电导法 9

3. 结果与分析 10

3.1 不同林带对土壤含水量的影响 11

3.2 不同林带对土壤PH的影响 12

3.3 不同林带对土壤全盐量的影响 13

3.4 不同林带对土壤磷含量的影响 15

4.结论 错误!未定义书签。7

参考文献 18

1. 引言

1.1研究目的和意义

沿海滩涂资源的开发利用一直是江苏扩大耕地资源，增加粮食供应的一条重要渠道和策略。根据历史上江苏治理盐碱地经验，主要是采用自然降水洗盐和植物改土降盐的方法。连云港徐圩新区规划面积467km²，区内大面积绿化不可能全部采用客土脱盐的办法，因此采用植物改土仍是低成本、高效率的土壤改良措施。考虑到局部快速绿化的需要，客土绿化也是值得考虑的措施之一。目前徐圩新区储量自然生长的盐生植物外，绿化树木主要分布在各生态园苗圃。试验区分布在江苏省香河农业开发生态园，园区在2016年引进栾树、女贞、广玉兰、紫薇、墨西哥柏等观赏性树种。但由于土壤含盐量较高，造林技术有限，绿化效果并不明显。另外在沿海地区发展植树造林工作，除了要看重植物的防护作用，更注重景观价值和经济价值，因此适宜徐圩新区耐盐绿化植物种植模式的筛选和应用显得施肥迫切。

本试验通过选取耐盐性树种墨西哥柏与紫薇、黄金柳、苦楝、大叶女贞、栾树5种不同林带土壤理化性质的对比研究，寻找适合在徐圩新区推广的林带模式，也为选育出能适用于盐碱地自然条件的墨西哥柏优良种源奠定基础。