Hartati, Fakhrina (2009) Peta Potensi Penyimpanan Karbon Diversitas Perdu di Kebun Raya Purwodadi (KRP) di Era Pemanasan Global. Magister thesis, Universitas Brawijaya.
Abstract
Hutan berperan penting untuk mengurangi emisi CO 2 dunia melalui carbon sink . Hutan mengabsorsi CO 2 selama proses fotosintesis dan menyimpannya sebagai materi organik dalam biomassa tanaman. Banyaknya materi organik yang tersimpan dalam biomassa hutan per unit luas dan waktu merupakan informasi penting dari produktivitas hutan. Penelitian ini bertujuan untuk mengetahui profil struktur komunitas perdu, biomassa karbon diversitas perdu serta melakukan evaluasi pengelolaan perdu di KRP sebagai hutan kota dan rosot karbon. Penelitian pemetaan diversitas perdu dilakukan dengan tiga tahap : diawali dengan analisis vegetasi perdu tiap vak dengan penentuan (struktur vegetasi, kerapatan, dominasi (INP), kekayaan taksa (spesies, famili dan ordo), indeks diversitas, stratifikasi dan biomassa karbon) tiap vak dan keseluruhan vak, selanjutnya dilakukan analisis pengelompokan berdasarkan seluruh variabel yang diamati. Evaluasi pengelolaan diversitas perdu di KRP dilakukan melalui gap analysis dengan membandingkan karakter vegetasi perdu di KRP dengan hutan hujan tropis dataran rendah di Indonesia atau negara lain. Analisis dilanjutkan dengan Root Cause Analysis dan menentukan faktor yang menjadi kekuatan dan kelemahan bagi KRP dengan menggunakan SWOT Analysis . Hasil penelitian menunjukkan bahwa di KRP ditemukan 12.713 individu perdu yang termasuk dalam 96 famili dan 42 ordo. Sebanyak 16% vak memiliki kerapatan yang menyerupai hutan hujan tropis dataran rendah. Sebagian besar 24% vak kodominasi spesies eksotik, 68% vak dominasi spesies eksotik, 4% dominasi spesies endemik dan 4% kodominasi spesies endemik, indeks diversitas perdu berkisar antara 1,56-6,87. Stratifikasi perdu menunjukkan 60% vak di KRP didominasi oleh strata C, 24% vak didominasi oleh strata D serta 16% vak memiliki strata C dan D yang seimbang. Potensi penyerapan CO 2 dalam bentuk biomassa karbon di KRP sebesar 1.338,44 Mg.ha -1 . Hasil analisis pengelompokan ( cluster analysis ) menunjukkan bahwa 92% vak termasuk dalam kelompok pertama yang memiliki karakteristik dalam hal jumlah famili dan indeks diversitas yang tinggi serta memiliki satu spesies dominan, kelompok kedua yang terdiri dari 4% vak dengan karakteristik sebagian besar didominasi oleh perdu yang memiliki strata D. hanya vak VII yang termasuk dalam kelompok tiga dengan kerapatan sangat tinggi mencapai 2.392 individu.ha -1 , memiliki jumlah ordo dan spesies yang tinggi serta didominasi oleh strata C dan menyimpan karbon paling tinggi mencapai 280,82 Mg.ha -1 . Permasalahan utama yang dihapai oleh KRP sebagai hutan kota diantaranya 60% vak memiliki kerapatan 115 individu.ha -1 , 92% vak didominasi spesies eksotik serta 84% vak memiliki biomassa 138 Mg.ha -1 . Untuk itu, diusulkan meninjau kembali beberapa vak yang masih memungkinkan ditingkatkan kerapatan perdu koleksi, meningkatkan eksplorasi tumbuhan endemik di wilayah Indonesia serta melakukan pemeliharaan anakan pohon agar dapat tumbuh lebih optimal.
English Abstract
Forest play an important role to reduce global CO 2 emission by carbon sink mechanism. Forest absorbs CO 2 during photosynthesis and save organic product as biomass. Storing large amount of organic matter in biomass per unit area and time can determine forest productivity. The aims of this research were to determine shrubs community structure profile, shrubs diversity, carbon biomass and then to evaluate the shrubs management in Purwodadi Botanical Garden (PBG) as carbon sink of city forest. The research was hold of in three steps, i.e. It is started by shrubs vegetation analysis in each area collection (vak) to determine some communities variables (vegetation structure, density, importance value index, stratification, diversity index, taxa richness (species, families and order), carbon biomass) in PBG. Moreover the cluster analysis was applied to group 25 vak based on those communities variables. Finally shrubs diversity management was evaluated in PBG by Gap Analysis. We compared all of variables between PBG and lowlands tropical rain forest in Indonesia or other tropical countries. It was followed by Root Cause , SWOT Analysis and proposing some suggestion to solve potential problems in PBG as city forest. The result showed that in PBG was found 12.713 individual of shrubs belonging 96 families and 42 orders. Density of 16% vak showed as much as lowlands tropical rain forest 115 individu.ha -1 . Dominancy by more than single exotic species was found in 24% vak, but 68% vak were dominated by an exotic plant. Then only 4% vak was dominated by the endemic. The diversity index of shrubs was highly variable ranged from 1.56 to 6.87. Shrubs stratification showed that 60% vak were dominated by C stratum and 24% vak were dominated by D stratum. Only 16% vak were equally dominated by C and D strata. Potential of carbon biomass in PBG reached 1.338,44 Mg.ha -1 . Based on the cluster analysis, it was showed that 92% vak were classified into first group and characterized by family richness and diversity index were high, also dominated by single dominat species. The second group consisted of 4% vak and showed dominated by D stratum. Only seven vak were set as third group and characterized by higher density (reached 2,392 individual.ha -1 ), high families or order richness, dominated by C stratum and saved the highest carbon 280.82 Mg.ha -1 . The potential main problems identified in PBG as a city forest were 60% vak showed less density ( 115 individual.ha -1 ), most of vak (92%) was dominated by the exotic species. Moreover, low carbon biomass ( 138 Mg.ha -1 ) was found in 84% vak. Therefore it was suggested to improve vak density by increasing shrubs collection, to enhance exploration of Indonesian endemic plants, as well as to handle care woody seedling to grow optimally .
| Item Type: | Thesis (Magister) |
|---|---|
| Identification Number: | TES/582.177 144/HAR/p/040902892 |
| Subjects: | 500 Natural sciences and mathematics > 582 Plants noted for specific vegetative characteristics and flowers > 582.1 Herbaceous and woody plants, plants noted for their flowers |
| Divisions: | S2/S3 > Magister Matematika, Fakultas MIPA |
| Depositing User: | Endro Setyobudi |
| Date Deposited: | 15 Feb 2013 14:47 |
| Last Modified: | 15 Feb 2013 14:47 |
| URI: | http://repository.ub.ac.id/id/eprint/157769 |
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