Method for reducing coexist crop Pb accumulation

Abstract

The invention provides a method of reducing lead accumulation of coexisting crops, which is to plant seeds of erect-straw cereal and wild legumes together in the lead polluted soil and irrigate water irregularly to keep the water content of the soil to be about 80%. When the planted erect-straw cereal is mature and harvested, the wild legumes can also be got. The wild legumes can be removed from the soil wholly so as to realize the purposes of getting safe products on the lead polluted soil and gradually removing the heavy metal lead. The invention fixes the lead in roots and plants by the great root system of the legumes, reduces the activity and concentration of lead in the rhizosphere of plants and reduces lead that enters and runs into seeds of erect-straw crops. The invention is reasonable in design, low in cost and strong in operability, which can be applied in removing the metal lead from crops that grow in the lead polluted soil.

Description

technical field

[0001] The invention relates to the phytoremediation technology of polluted environment, in particular, it is a method for reducing the absorption and accumulation of lead by crops to achieve safe production of crops by using a leguminous plant corngrass (Kummerowia striata Schindl.). Background technique

[0002] The phytoremediation technology developed by using the characteristics of plants to absorb, transform, fix and activate soil heavy metals has always been an important aspect of the research on soil heavy metal pollution remediation technology. From the perspective of phytoremediation, the phytoremediation technologies that have been developed mainly include root filtration technology, plant extraction technology, plant stabilization technology and plant volatilization technology. Among them, the technology of extracting soil heavy metal elements by overabsorbing excessively accumulating plants has attracted special attention. Since Brooks proposed ...

Examples

Embodiment 1

[0015] Example 1: Characteristics of corngrass accumulating lead in lead-contaminated soil

[0016] Trials were conducted in 2004 and 2005. This test is a simulated plot test, which is completed in two years. The plot is simulated by using a mesocosmic system with a size of 46cm×35cm×23cm, each filled with 32kg of soil. The soil used in the test comes from Huyou orchard (28°54′N, 118°30′E) in Changshan County, Zhejiang Province, which is a red soil developed from Quaternary red clay parent material. Soil pH 4.59 (CaCl 2 ).Soil organic matter content is 34.39g.kg -1 , available nitrogen is 28.08mg.kg -1 , available phosphorus is 8.99mg.kg -1 , available potassium is 108.23mg.kg -1 , the soil background lead concentration is 23.27mg.kg -1 .

[0017] The test set 3 levels of lead concentration treatment, respectively adding a concentration of 0mg.kg on the basis of the original soil -1 , 300mg.kg -1 and 600mg.kg -1 lead, with 4 replicates per treatment. (The actual lea...

Embodiment 2

[0022] Embodiment 2: Mixed planting test of corn grass and corn

[0023] Trials were conducted in 2005. This test is a simulated plot test. The plot is simulated by using a mesocosmic system with a size of 46cm×35cm×23cm, each loaded with 32kg of soil. The soil used in the test comes from Huyou orchard (28°54′N, 118°30′E) in Changshan County, Zhejiang Province, which is a red soil developed from Quaternary red clay parent material. Soil pH4.59 (CaCl 2 ).Soil organic matter content is 34.39g.kg -1 , available nitrogen is 28.08mg.kg -1 , available phosphorus is 8.99mg.kg -1 , available potassium is 108.23mg.kg -1 , the soil background lead concentration is 23.27mg.kg -1 .

[0024] The test set 3 levels of lead concentration treatment, respectively adding a concentration of 0mg.kg on the basis of the original soil -1 , 300mg.kg -1 and 600mg.kg -1 lead, with 4 replicates per treatment. (The actual lead concentration in the soil is subject to the sampling measurement res...

Embodiment 3

[0032] Embodiment 3: mycorrhizal fungus inoculation corn grass test

[0033] Trials were conducted in 2006. This test is a simulated plot test. The plot is simulated by using a mesocosmic system with a size of 46cm×35cm×23cm, each loaded with 32kg of soil. The soil used in the test comes from Huyou orchard (28°54′N, 118°30′E) in Changshan County, Zhejiang Province, which is a red soil developed from Quaternary red clay parent material. Soil pH 4.59 (CaCl 2 ).Soil organic matter content is 34.39g.kg -1 , available nitrogen is 28.08mg.kg -1 , available phosphorus is 8.99mg.kg -1 , available potassium is 108.23mg.kg -1 , the soil background lead concentration is 23.27mg.kg -1 .

[0034] The test set 3 levels of lead concentration treatment, respectively adding a concentration of 0mg.kg on the basis of the original soil -1 , 300mg.kg -1 and 600mg.kg -1 lead, with 4 replicates per treatment. (The actual lead concentration in the soil is subject to the sampling and measur...

technical field

[0001] The invention relates to the phytoremediation technology of polluted environment, in particular, it is a method for reducing the absorption and accumulation of lead by crops to achieve safe production of crops by using a leguminous plant corngrass (Kummerowia striata Schindl.). Background technique

[0002] The phytoremediation technology developed by using the characteristics of plants to absorb, transform, fix and activate soil heavy metals has always been an important aspect of the research on soil heavy metal pollution remediation technology. From the perspective of phytoremediation, the phytoremediation technologies that have been developed mainly include root filtration technology, plant extraction technology, plant stabilization technology and plant volatilization technology. Among them, the technology of extracting soil heavy metal elements by overabsorbing excessively accumulating plants has attracted special attention. Since Brooks proposed ...

Examples

Embodiment 1

[0015] Example 1: Characteristics of corngrass accumulating lead in lead-contaminated soil

[0016] Trials were conducted in 2004 and 2005. This test is a simulated plot test, which is completed in two years. The plot is simulated by using a mesocosmic system with a size of 46cm×35cm×23cm, each filled with 32kg of soil. The soil used in the test comes from Huyou orchard (28°54′N, 118°30′E) in Changshan County, Zhejiang Province, which is a red soil developed from Quaternary red clay parent material. Soil pH 4.59 (CaCl 2 ).Soil organic matter content is 34.39g.kg -1 , available nitrogen is 28.08mg.kg -1 , available phosphorus is 8.99mg.kg -1 , available potassium is 108.23mg.kg -1 , the soil background lead concentration is 23.27mg.kg -1 .

[0017] The test set 3 levels of lead concentration treatment, respectively adding a concentration of 0mg.kg on the basis of the original soil -1 , 300mg.kg -1 and 600mg.kg -1 lead, with 4 replicates per treatment. (The actual lea...

Embodiment 2

[0022] Embodiment 2: Mixed planting test of corn grass and corn

[0023] Trials were conducted in 2005. This test is a simulated plot test. The plot is simulated by using a mesocosmic system with a size of 46cm×35cm×23cm, each loaded with 32kg of soil. The soil used in the test comes from Huyou orchard (28°54′N, 118°30′E) in Changshan County, Zhejiang Province, which is a red soil developed from Quaternary red clay parent material. Soil pH4.59 (CaCl 2 ).Soil organic matter content is 34.39g.kg -1 , available nitrogen is 28.08mg.kg -1 , available phosphorus is 8.99mg.kg -1 , available potassium is 108.23mg.kg -1 , the soil background lead concentration is 23.27mg.kg -1 .

[0024] The test set 3 levels of lead concentration treatment, respectively adding a concentration of 0mg.kg on the basis of the original soil -1 , 300mg.kg -1 and 600mg.kg -1 lead, with 4 replicates per treatment. (The actual lead concentration in the soil is subject to the sampling measurement res...

Embodiment 3

[0032] Embodiment 3: mycorrhizal fungus inoculation corn grass test

[0033] Trials were conducted in 2006. This test is a simulated plot test. The plot is simulated by using a mesocosmic system with a size of 46cm×35cm×23cm, each loaded with 32kg of soil. The soil used in the test comes from Huyou orchard (28°54′N, 118°30′E) in Changshan County, Zhejiang Province, which is a red soil developed from Quaternary red clay parent material. Soil pH 4.59 (CaCl 2 ).Soil organic matter content is 34.39g.kg -1 , available nitrogen is 28.08mg.kg -1 , available phosphorus is 8.99mg.kg -1 , available potassium is 108.23mg.kg -1 , the soil background lead concentration is 23.27mg.kg -1 .

[0034] The test set 3 levels of lead concentration treatment, respectively adding a concentration of 0mg.kg on the basis of the original soil -1 , 300mg.kg -1 and 600mg.kg -1 lead, with 4 replicates per treatment. (The actual lead concentration in the soil is subject to the sampling and measur...