当前世界环境

Introduction

Mining is extraction of valuable minerals or other geological materials in or on the earth planet. The mining procedures, the materials are expelled from the earth by stabbing and detonating. The two methods of mining for desolation of nature ore are, opencast (surface mining) and underground mining. Opencast mining process is making for extracting minerals near the surface of the earth or for soft-rocks. The classification of these types of mining is based desired parameters for their application. Open cast mining cause unnecessary air pollution as they produce huge quantities of wastes than underground mining.¹It has therefore become necessary for governments, regulatory agencies, local communities and the industry itself to adopt strategies attributing landscape, flora and fauna properties to ensuring the functionality of reclaimed ecosystem.²The top soil especially gets seriously damaged during extraction.³Mining is a worldwide Marvel and has been the reason for concern wherever on the planet, including the propelled nations. In one hand this action has prompted the improvement in different division viz.- social, monetary, transport, educational and industrial etc, and in other hand such huge number of severe concerns related with natural environment. So deterioration in physical, chemical, and biological quality of the environment affects both flora and fauna resources.⁴

Specifically, usually important to detonate rocks with boring, blasting with explosives and drilling, so as to extricate material however this strategy for extraction offers ascend to heavy noise, it denoted to noise pollution. The other vital ecological issues related to mining of sandstone along with noise pollution are - environmental problems such as - pollution of water and air, depletion of vegetation cover, emergence and growth of xerophytes species, instability of the Mountain, loss of natural resources, fauna and biodiversity and change in land topography, degradation of agriculture land, and also the soil and rock masses. According to Lamb (2001) reclamation is mostly used to refer to re-vegetation of highly degraded site such as mined lands.⁵

Socio-economic benefits have been generated from mining while there have been unfavorable effects of mining to the ecosystem due to enormous excavation and elimination of soil and rock layers.⁶Mining causes huge damage to biological communities and landscapes to the earth.⁷During sandstone mining activities involved extraction like-drilling, blasting, loading and transportation by this generate dust into the mining besides areas causes air pollution by SPM (suspended particulate matter). The pollutants released in atmosphere by motorized machines involved during the mining process like-bulldozer, drilling machine, dumper, tractor and other transportation vehicles.

Mining is a major source of economy in Rajasthan but is also a major cause of ecological disturbance due to the land degradation and related changes in the structural and functional characteristics of the native vegetation.⁸India has its peerless character on the planet because of the extraordinary decent variety of natural biological communities⁹and rich plant variety in its diverse parts.¹⁰It holds approximate 49,000 plant species, 2.4% overall topographical region and 08% biodiversity of the world.¹¹The plant refines air through the method of photosynthesis and furthermore expels numerous toxicants from air, water and soil.¹²The plants assimilate heat and discharge water vapor to retain temperature¹³and furthermore increment moistness in environment.¹⁴The plants inhibit soil disintegration¹⁵and enhance soil fecundity.¹⁶在开采边界影响的生态系统是the aquatic and terrestrial bodies and the effects could extend beyond the boundaries of the mining area for a long time period. The mining and quarrying activities are mainly responsible for decreasing of faunal diversity and population distribution of wild life but beneficial to some adaptable species.¹⁷

Vegetation is the principle part of earthbound ecosystems.¹⁸Timberland ecosystems give items and administrations that are of incentive to human social orders.¹⁹Vital ecological issues related to mining of sandstone are- environmental problems, on the surrounding area leaving the region appeared scarred with irregular patches.

The resultant to mining, loss of surface and subterranean biodiversity makes an enormously ruthless condition which is unsuitable for restoration of the local biological community²⁰with high financial esteem, and makes the region unfit for utilization of the local societies. Opencast mining in Chaukari kalan has regularly caused irreversible changes in vegetation, fauna, hydrology, and soil science and the formation of enormous overload dumps. Thusly, disposed of mines are perceived as man-made deserted destinations which have impacts on both an environmental and monetary weight on society.²¹Vegetation investigation of this mining region would help in understanding the influence of mining on the floral variety. The mining zone which is under investigation have been undermining from quite a while, therefore, the present examination deals with the plant species diversity and impact of mining exercises in and around Chaukri kalan mining zone.

Materials and Methods

The present study has been carried out at Chaukri kalan open cast mining zones of Jodhpur district, situated at 26°51’09.62”N latitude and 73°66’69.18”E longitude amid July, 2018 to June, 2019 (Fig. 1).

The examination region was inspected in a regular routine amid the field surveys. Field overview was led in each season consistently. Arbitrary points were selected in the study area, the latitude-longitude coordinates were recorded with the assistance of a GPS. In those chosen points the vegetation cover of a 10mX10m region was made with the assistance of ropes and poles. This 100m²region was then overviewed by getting an exhaustive tally of the quantity of plants in it. The species were identified to the assistance of accessible literature. The native names were solicited from the neighborhood individuals from the concerned zones. Any obscure plant species was either photographed or gathered so as to get it recognized later on. Rest were distinguished, counted and archived.

Data analysis for vegetation cover- Floristic analysis at mined and non-mined zones were estimated using diversity indices like as, richness, diversity and evenness-

Formulas-

Pi= n/N

Where,

n= number of species

N= total number of species observed in all families

Pi LN Pi = Hs

Where,

LN = natural logarithms

Hs= Shannon waiver diversity index

Richness= n/√N

Evenness= Hs/ n

Figure 1: Map showing mining and its affected zone at Chaukri kalan. (Source- Google Maps) Click here to view Figure

Results and Discussion

From the study area an aggregate of 81 diverse plant species have been observed at Chaukri kalan non-mined study site. In which 50 species were of herbs, 14 of shrubs and 17 of trees were observed whereas only 64 plant species were observed in mined area.

In non mined area, the observed diversity indices Simpsons (D) and Shannon Wiener (Hs) were 42.77584 and 4.01195 respectively while in mined area, the diversity indices were observed 27.80326595 and 3.65606 respectively.

The study result shows that in non-mined areaFagonia creticahad highest richness (4.692416) whileFicus bengalensishad lowest (0.01188) and the highest and lowest evenness was observed forHaloptelea integrifolia(8.408658) andFagonia cretica(1.54508) respectively. The observation of mined area shows thatTephrosia purpuriahad highest richness (3.31919) whileSarcostemma acidum,Crotalaria medicaginea,Lucas asperaandAzadirachta indicahad similar and lowest richness (0.054413). The highest and lowest evenness in mined area was observed forSarcostemma acidum(12.14517) andTephrosia purpuria(1.752363) respectively (Table. 1)

Table 1: Showing richness and evenness of plant species in mined and non-mined zones.

The mining action reasonably ruins the vegetation cover. The diversity indices of the mining site showed the big difference to non-mined site. The non-mined zone had higher Simpsons (D) and Shannon Wiener (Hs) indices as compared to mined zone. The investigation site has rich sources from floral biodiversity purpose of perspectives.

Habitat annihilation is the leading cause of species extinction and biodiversity loss in natural ecosystems.^{22, 23}在采矿活动名单的爆破技术es harmful gases and dust particles (as SPM). These dust particles mixed with gaseous composition and deposited on the upper and lower surface of leaves, so the upper and lower surface stomata were closed with thin layer of dust (Fig. 2). It causes less gases exchange and pigment loss of leaves. In other hand the thin layer of dust blocks the absorption of sun energy by leaf, which causes decreased photosynthesis and respiration; it results in the plant senescence or plant death. Deposition of mined exhausted toxic and harmful particles on upper layer of soil caused changes in soil physio-chemical parameters and surface texture composition (acidic/ alkaline/ saline/ toxicity), consequently this type of soil would not be useful for vegetation growth. The stones/rocks of the size beyond what 25cm could seriously influence the root entrance of plants and result in stunted development, that too when the level of stones surpasses 50-60(%) of soil.²⁴根据Haule等人的石灰石开采study area exposed to devastate natural vegetation and it was revealed by the existence of the large mining pit found in the study area covering about 38.25 ha of the forest cleared for limestone mining. It had also substantiated by 61.7% of the respondents who noticed an increase in deforestation in Usongwe Division.²⁵Biswas et al. also concluded that the floral diversity was disturbed by opencast mining in Sonepur Bazari of Raniganj coalfield area, West Bengal.²⁶International Council on Mining & Minerals (July 2005) recommend that, there ought to be precise arranging and biodiversity balances while building up mining industries, so harm because of mining could be redressed.²⁷

Figure 2: A-B showing mining activities and C-D showing mining dust on crop and crop field. Click here to view Figure

Figure 3: Richness of Species: Mined area from Chaukri Kalan Study Site Click here to view Figure

Figure 4: Evenness of Species: Mined area from Chaukri Kalan Study Site Click here to view Figure

图5:丰富的物种:非开采区域Chaukri Kalan Study Site Click here to view Figure

Figure 6: Evenness of Species: Non mined area from Chaukri Kalan Study Site Click here to view Figure

Conclusion

The stone mining at Chaukri kalan site has incredibly influenced the natural environment and vegetation diversity. Plants have been stripped off their normal territory because of stone mining exercises. The nonappearance of natural vegetation has extraordinarily expanded the danger of gorge disintegration in mining territories. The outcome investigation shows that mining tasks are directly or in a indirect way influences the vegetation, changes the soil surface and climatic condition. So it can be presumed that the mining tasks influences the nearby plants diversity and climatic conditions of encompassing regions. The present study is limited to sand stone mining area and its surrounding vegetation which showed the depletion impact on floral diversity. It is necessary to conduct further research on other types of mines to get satisfactory information about mining impacts on surrounding floral diversity.

Acknowledgement

The authors are thankful to Head, Department of Zoology, Jai Narain Vyas University, Jodhpur, for providing research facilities. Thanks are due to Dr. Harshvardhan Singh, Surendra Jaipal, Prakash Panwar and Tejendra Kumar for precious support in field work. Sincere thanks to the entire civilians at the study site to behave in a cooperative manner and providing all types of assistances and valuable information as needed.

Funding

The author(s) received no financial support for the research, authorship, and/or publication of this article.

Conflict of Interest

The authors do not have any conflict of interest.

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